Fix an unsupported type annotation on Python 3.10 and earlier. (#13181)

Fix a regression where truststore would never be used while installing build dependencies. (#13186)

Deprecate theno-python-version-warning flag as it has long done nothingsince Python 2 support was removed in pip 21.0. (#13154)

Prefer to displayPEP 639License-Expression inpipshow if metadata version is at least 2.4. (#13112)

SupportPEP 639License-Expression andLicense-File metadata fields in JSONoutput.pipinspect andpipinstall--report now emitlicense_expression andlicense_file fields in themetadata object,if the corresponding fields are present in the installedMETADATA file. (#13134)

Files in the network cache will inherit the read/write permissions of pip’s cachedirectory (in addition to the current user retaining read/write access). Thisenables a single cache to be shared among multiple users. (#11012)

Return the size, along with the number, of files cleared onpipcachepurge andpipcacheremove (#12176)

Cachepython-requires checks while filtering potential installation candidates. (#13128)

Optimize package collection by avoiding unnecessary URL parsing and other processing. (#13132)

Reorder the encoding detection when decoding a requirements file, relying onUTF-8 over the locale encoding by default, matching the documented behaviour.(#12771)

The pip version self check is disabled onEXTERNALLY-MANAGED environments. (#11820)

Fix a security bug allowing a specially crafted wheel to execute code duringinstallation. (#13079)

The inclusion ofpackaging 24.2 changes how pre-release specifiers with< and>behave. Including a pre-release version with these specifiers now impliesaccepting pre-releases (e.g.,<2.0dev can include1.0rc1). To avoidimplying pre-releases, avoid specifying them (e.g., use<2.0).The exception is!=, which never implies pre-releases. (#13163)

The--cert and--client-cert command-line options are now respected whileinstalling build dependencies. Consequently, the private_PIP_STANDALONE_CERTenvironment variable is no longer used. (#5502)

The--proxy command-line option is now respected while installing build dependencies. (#6018)

Upgrade CacheControl to 0.14.1

Upgrade idna to 3.10

Upgrade msgpack to 1.1.0

Upgrade packaging to 24.2

Upgrade platformdirs to 4.3.6

Upgrade pyproject-hooks to 1.2.0

Upgrade rich to 13.9.4

Upgrade tomli to 2.2.1

Removed section about non-existing--force-keyring flag. (#12455)

Started releasing to PyPI from a GitHub Actions CI/CD workflow that implements trusted publishing and bundlesPEP 740 digital attestations.

Allow multiple nested inclusions of the same requirements file again. (#13046)

Deprecate wheel filenames that are not compliant withPEP 440. (#12918)

Detect recursively referencing requirements files and help users identifythe source. (#12653)

Support forPEP 730 iOS wheels. (#12961)

Display a better error message when an already installed package has an invalid requirement. (#12953)

IgnorePIP_TARGET andpip.confglobal.target when preparing a build environment. (#8438)

Restore support for macOS 10.12 and older (via truststore). (#12901)

Allow installing pip in editable mode in a virtual environment on Windows. (#12666)

Upgrade certifi to 2024.8.30

Upgrade distlib to 0.3.9

Upgrade truststore to 0.10.0

Upgrade urllib3 to 1.26.20

Deprecatepipinstall--editable falling back tosetup.pydevelopwhen using a setuptools version that does not supportPEP 660(setuptools v63 and older). (#11457)

Check unsupported packages for the current platform. (#11054)

Use system certificatesand certifi certificates to verify HTTPS connections on Python 3.10+.Python 3.9 and earlier only use certifi.

To revert to previous behaviour, pass the flag--use-deprecated=legacy-certs. (#11647)

Improve discovery performance of installed packages when theimportlib.metadatabackend is used to load distribution metadata (used by default under Python 3.11+). (#12656)

Improve performance when the same requirement string appears many times duringresolution, by consistently caching the parsed requirement string. (#12663)

Minor performance improvement of finding applicable package candidates by notrepeatedly calculating their versions (#12664)

Disable pip’s self version check when invoking a pip subprocess to installPEP 517 build requirements. (#12683)

Improve dependency resolution performance by caching platform compatibilitytags during wheel cache lookup. (#12712)

wheel is no longer explicitly listed as a build dependency ofpip.setuptools injects this dependency in theget_requires_for_build_wheel()hook and no longer needs it on newer versions. (#12728)

Ignore--require-virtualenv forpipcheck andpipfreeze (#12842)

Improve package download and install performance.

Increase chunk sizes when downloading (256 kB, up from 10 kB) and reading files (1 MB, up from 8 kB).This reduces the frequency of updates to pip’s progress bar. (#12810)

Improve pip install performance.

Files are now extracted in 1MB blocks, or in one block matching the file size forsmaller files. A decompressor is no longer instantiated when extracting 0 bytes files,it is not necessary because there is no data to decompress. (#12803)

Setno_color to globalrich.Console instance. (#11045)

Fix resolution to respect--python-version when checkingRequires-Python. (#12216)

Perform hash comparisons in a case-insensitive manner. (#12680)

Avoiddlopen failure for glibc detection in musl builds (#12716)

Avoid keyring logging crashes when pip is run in verbose mode. (#12751)

Fix finding hardlink targets in tar files with an ignored top-level directory. (#12781)

Improve pip install performance by only creating required parentdirectories once, instead of before extracting every file in the wheel. (#12782)

Improve pip install performance by calculating installed packages printoutin linear time instead of quadratic time. (#12791)

Remove vendored tenacity.

Update the preload list for theDEBUNDLED case, to replacepep517 that has been renamed topyproject_hooks.

Use tomllib from the stdlib if available, rather than tomli

Upgrade certifi to 2024.7.4

Upgrade platformdirs to 4.2.2

Upgrade pygments to 2.18.0

Upgrade setuptools to 70.3.0

Upgrade typing_extensions to 4.12.2

Correct—-ignore-conflicts (including an em dash) to--ignore-conflicts. (#12851)

Fix finding hardlink targets in tar files with an ignored top-level directory. (#12781)

Actually use system trust stores when the truststore feature is enabled.

Upgrade requests to 2.32.3

Upgrade truststore to 0.9.1.

Report informative messages about invalid requirements. (#12713)

Eagerly import the self version check logic to avoid crashes while upgrading or downgrading pip at the same time. (#12675)

Accommodate for mismatches between different sources of truth for extra names, for packages generated bysetuptools. (#12688)

Accommodate for development versions of CPython ending in+ in the version string. (#12691)

Upgrade packaging to 24.1

Upgrade requests to 2.32.0

Remove vendored colorama

Remove vendored six

Remove vendored webencodings

Remove vendored charset_normalizer

requests provides optional character detection support on some APIs when processing ambiguous bytes. This isn’t relevant for pip to function and we’re able to remove it due to recent upstream changes.

Drop support for EOL Python 3.7. (#11934)

Remove support for legacy versions and dependency specifiers.

Packages with non standard-compliant versions or dependency specifiers are now ignored by the resolver.Already installed packages with non standard-compliant versions or dependency specifiersmust be uninstalled before upgrading them. (#12063)

Improve performance of resolution of large dependency trees, with more caching. (#12453)

Further improve resolution performance of large dependency trees, by caching hash calculations. (#12657)

Reduce startup time of commands (e.g. show, freeze) that do not access the network by 15-30%. (#4768)

Reword and improve presentation of uninstallation errors. (#10421)

Add a ‘raw’ progress_bar type for simple and parsable download progress reports (#11508)

piplist no longer performs the pip version check unless--outdated or--uptodate is given. (#11677)

Use thedata_filter when extracting tarballs, if it’s available. (#12111)

Display the Project-URL value under key “Home-page” inpipshow when the Home-Page metadata field is not set.

The Project-URL key detection is case-insensitive, and ignores any dashes and underscores. (#11221)

Ensure-vv gets passed to anypipinstall build environment subprocesses. (#12577)

Deduplicate entries in theRequires field ofpipshow. (#12165)

Fix error on checkout for subversion and bazaar with verbose mode on. (#11050)

Fix exception with completions when COMP_CWORD is not set (#12401)

Fix intermittent “cannot locate t64.exe” errors when upgrading pip. (#12666)

Remove duplication in invalid wheel error message (#12579)

Remove the incorrect pip3.x console entrypoint from the pip wheel. This consolescript continues to be generated by pip when it installs itself. (#12536)

Gracefully skip VCS detection in pip freeze when PATH points to a non-directory path. (#12567)

Make the--proxy parameter take precedence over environment variables. (#10685)

Add charset-normalizer 3.3.2

Remove chardet

Remove pyparsing

Upgrade CacheControl to 0.14.0

Upgrade certifi to 2024.2.2

Upgrade distro to 1.9.0

Upgrade idna to 3.7

Upgrade msgpack to 1.0.8

Upgrade packaging to 24.0

Upgrade platformdirs to 4.2.1

Upgrade pygments to 2.17.2

Upgrade rich to 13.7.1

Upgrade setuptools to 69.5.1

Upgrade tenacity to 8.2.3

Upgrade typing_extensions to 4.11.0

Upgrade urllib3 to 1.26.18

Document UX research done on pip. (#10745)

Fix the direct usage of zipapp showing up aspython-mpip.pyz rather than./pip.pyz /.\pip.pyz (#12043)

Add a warning explaining that the snippet in “Fallback behavior” is not a validpyproject.toml snippet for projects, and link to setuptools documentationinstead. (#12122)

The Python Support Policy has been updated. (#12529)

Document the environment variables that correspond with CLI options. (#12576)

Update architecture documentation for command line interface. (#6831)

Removesetup.py since all the pip project metadata is now declared inpyproject.toml.

Move remaining pip development tools configurations topyproject.toml.

Retry on HTTP status code 502 (#11843)

Automatically use the setuptools PEP 517 build backend when--config-settings isused for projects withoutpyproject.toml. (#11915)

Make pip freeze and pip uninstall of legacy editable installs of packages whose namecontains_ compatible withsetuptools>=69.0.3. (#12477)

Support per requirement--config-settings for editable installs. (#12480)

Optimized usage of--find-links=<path-to-dir>, by only scanning the relevant directory once, only considering file names that are valid wheel or sdist names, and only considering files in the directory that are related to the install. (#12327)

Removedwheel from the[build-system].requires list fallbackthat is used whenpyproject.toml is absent. (#12449)

Upgrade distlib to 0.3.8

Fix explanation of how PIP_CONFIG_FILE works (#11815)

Fix outdated pip install argument description in documentation. (#12417)

Replace some links to PEPs with links to the canonical specifications on thePython Packaging User Guide (#12434)

Updated thepyproject.toml document to stop suggestingto depend onwheel as a build dependency directly. (#12449)

Update supported interpreters in development docs (#12475)

Most project metadata is now defined statically via pip’spyproject.toml file.

Fix a bug in extras handling for link requirements (#12372)

Fix mercurial revision “parse error”: use--rev={ref} instead of-r={ref} (#12373)

Handle a timezone indicator of Z when parsing dates in the self check. (#12338)

Fix bug where installing the same package at the same time with multiple pip processes could fail. (#12361)

Added reference tovulnerability reporting guidelines to pip’s security policy.

Drop a fallback to using SecureTransport on macOS. It was useful when pip detected OpenSSL older than 1.0.1, but the current pip does not support any Python version supporting such old OpenSSL versions. (#12175)

Improve extras resolution for multiple constraints on same base package. (#11924)

Improve use of datastructures to make candidate selection 1.6x faster. (#12204)

Allowpipinstall--dry-run to use platform and ABI overriding options. (#12215)

Addis_yanked boolean entry to the installation report (--report) to indicate whether the requirement was yanked from the index, but was still selected by pip conform toPEP 592. (#12224)

Ignore errors in temporary directory cleanup (show a warning instead). (#11394)

Normalize extras according toPEP 685 from package metadata in the resolverfor comparison. This ensures extras are correctly compared and merged as longas the package providing the extra(s) is built with values normalized accordingto the standard. Note, however, that thisdoes not solve cases where thepackage itself contains unnormalized extra values in the metadata. (#11649)

Prevent downloading sdists twice whenPEP 658 metadata is present. (#11847)

Include all requested extras in the install report (--report). (#11924)

Removed uses ofdatetime.datetime.utcnow from non-vendored code. (#12005)

Consistently report whether a dependency comes from an extra. (#12095)

Fix completion script for zsh (#12166)

Fix improper handling of the new onexc argument ofshutil.rmtree() in Python 3.12. (#12187)

Filter out yanked links from the available versions error message: “(from versions: 1.0, 2.0, 3.0)” will not contain yanked versions conform PEP 592. The yanked versions (if any) will be mentioned in a separate error message. (#12225)

Fix crash when the git version number contains something else than digits and dots. (#12280)

Use-r=... instead of-r... to specify references with Mercurial. (#12306)

Redact password from URLs in some additional places. (#12350)

pip uses less memory when caching large packages. As a result, there is a new on-disk cache format stored in a new directory ($PIP_CACHE_DIR/http-v2). (#2984)

Upgrade certifi to 2023.7.22

Add truststore 0.8.0

Upgrade urllib3 to 1.26.17

Document thatpipsearch support has been removed from PyPI (#12059)

Clarify --prefer-binary in CLI and docs (#12122)

Document that using OS-provided Python can cause pip’s test suite to report false failures. (#12334)

DisablePEP 658 metadata fetching with the legacy resolver. (#12156)

Deprecate support for eggs for Python 3.11 or later, when the newimportlib.metadata backend is used to load distribution metadata. This only affects the eggdistribution format (with the.egg extension); distributions using the.egg-infometadata format (but are not actually eggs) are not affected. For more information about eggs, seerelevant section in the setuptools documentation.

Deprecate legacy version and version specifiers that don’t conform to thespecification.(#12063)

freeze no longer excludes thesetuptools,distribute, andwheelfrom the output when running on Python 3.12 or later, where they are notincluded in a virtual environment by default. Use--exclude if you wish toexclude any of these packages. (#4256)

make rejection messages slightly different between 1 and 8, so the user can make the difference. (#12040)

Fixpipcompletion--zsh. (#11417)

Prevent downloading files twice whenPEP 658 metadata is present (#11847)

Add permission check before configuration (#11920)

Fix deprecation warnings in Python 3.12 for usage of shutil.rmtree (#11957)

Ignore invalid or unreadableorigin.json files in the cache of locally built wheels. (#11985)

Fix installation of packages withPEP 658 metadata using non-canonicalized names (#12038)

Correctly parsedist-info-metadata values from JSON-format index data. (#12042)

Fail with an error if the--python option is specified after the subcommand name. (#12067)

Fix slowness when usingimportlib.metadata (the default way for pip to read metadata in Python 3.11+) and there is a large overlap between already installed and to-be-installed packages. (#12079)

Pass the-r flag to mercurial to be explicit that a revision is passed and protectagainsthg options injection as part of VCS URLs. Users that do not have control onVCS URLs passed to pip are advised to upgrade. (#12119)

Upgrade certifi to 2023.5.7

Upgrade platformdirs to 3.8.1

Upgrade pygments to 2.15.1

Upgrade pyparsing to 3.1.0

Upgrade Requests to 2.31.0

Upgrade rich to 13.4.2

Upgrade setuptools to 68.0.0

Updated typing_extensions to 4.6.0

Upgrade typing_extensions to 4.7.1

Upgrade urllib3 to 1.26.16

Upgrade setuptools to 67.7.2

Revert#11487, as it causes issues with virtualenvs created by the Windows Store distribution of Python. (#11987)

Revert pkg_resources (via setuptools) back to 65.6.3

Update documentation to reflect the new behavior of using the cache of locallybuilt wheels in hash-checking mode. (#11967)

Remove support for the deprecated--install-options. (#11358)

--no-binary does not implysetup.pyinstall anymore. Instead a wheel will bebuilt locally and installed. (#11451)

--no-binary does not disable the cache of locally built wheels anymore. It onlymeans “don’t download wheels”. (#11453)

Deprecate--build-option and--global-option. Users are invited to switch to--config-settings. (#11859)

Using--config-settings with projects that don’t have apyproject.toml now printsa deprecation warning. In the future the presence of config settings will automaticallyenable the default build backend for legacy projects and pass the settings to it. (#11915)

Removesetup.pyinstall fallback when building a wheel failed for projects withoutpyproject.toml. (#8368)

When thewheel package is not installed, pip now uses the default build backendinstead ofsetup.pyinstall andsetup.pydevelop for project withoutpyproject.toml. (#8559)

Specify egg-link location in assertion message when it does not match installed location to provide better error message for debugging. (#10476)

Present conflict information during installation after each choice that is rejected (pass-vv topipinstall to show it) (#10937)

Display dependency chain on each Collecting/Processing log line. (#11169)

Support a per-requirement--config-settings option in requirements files. (#11325)

The--config-settings/-C option now supports using the same key multipletimes. When the same key is specified multiple times, all values are passed tothe build backend as a list, as opposed to the previous behavior, where pip wouldonly pass the last value if the same key was used multiple times. (#11681)

Add-C as a short version of the--config-settings option. (#11786)

Reduce the number of resolver rounds, since backjumping makes the resolver more efficient in finding solutions. This also makes pathological cases fail quicker. (#11908)

Warn if--hash is used on a line without requirement in a requirements file. (#11935)

Stop propagating CLI--config-settings to the build dependencies. They already didnot propagate to requirements provided in requirement files. To pass the same configsettings to several requirements, users should provide the requirements as CLIarguments. (#11941)

Support wheel cache when using--require-hashes. (#5037)

Add--keyring-provider flag. See the Authentication page in the documentation for more info. (#8719)

In the case of virtual environments, configuration files are now also included from the base installation. (#9752)

Fix grammar by changing “A new release of pip available:” to “A new release of pip is available:” in the notice used for indicating that. (#11529)

Normalize paths before checking if installed scripts are on PATH. (#11719)

Correct the way to decide if keyring is available. (#11774)

More consistent resolution backtracking by removing legacy hack related to setuptools resolution (#11837)

IncludeAUTHORS.txt in pip’s wheels. (#11882)

Theuninstall andinstall--force-reinstall commands no longer callnormalize_path() repeatedly on the same paths. Instead, these results arecached for the duration of an uninstall operation, resulting in improvedperformance, particularly on Windows. (#11889)

Fix and improve the parsing of hashes embedded in URL fragments. (#11936)

When package A depends on package B provided as a direct URL dependency including a hashembedded in the link, the--require-hashes option did not warn when user supplied hasheswere missing for package B. (#11938)

Correctly reportrequested_extras in the installation report when extras arespecified for a local directory installation. (#11946)

When installing an archive from a direct URL or local file, populatedownload_info.info.hashes in the installation report, in addition to the legacydownload_info.info.hash key. (#11948)

Upgrade msgpack to 1.0.5

Patch pkg_resources to remove dependency onjaraco.text.

Upgrade platformdirs to 3.2.0

Upgrade pygments to 2.14.0

Upgrade resolvelib to 1.0.1

Upgrade rich to 13.3.3

Upgrade setuptools to 67.6.1

Upgrade tenacity to 8.2.2

Upgrade typing_extensions to 4.5.0

Upgrade urllib3 to 1.26.15

Cross-reference the--python flag from the--prefix flag,and mention limitations of--prefix regarding script installation. (#11775)

Add SECURITY.md to make the policy official. (#11809)

Add username to Git over SSH example. (#11838)

Quote extras in the pip install docs to guard shells with default globqualifiers, like zsh. (#11842)

Make it clear that requirements/constraints file can be a URL (#11954)

Ignore PIP_REQUIRE_VIRTUALENV forpipindex (#11671)

Implement--break-system-packages to permit installing packages intoEXTERNALLY-MANAGED Python installations. (#11780)

Improve handling of isolated build environments on platforms thatcustomize the Python’s installation schemes, such as Debian andHomebrew. (#11740)

Do not crash in presence of misformatted hash field indirect_url.json. (#11773)

Change the hashes in the installation report to be a mapping. Emit thearchive_info.hashes dictionary indirect_url.json. (#11312)

Implement logic to read theEXTERNALLY-MANAGED file as specified inPEP 668.This allows a downstream Python distributor to prevent users from using pip tomodify the externally managed environment. (#11381)

Enable the use ofkeyring found onPATH. This allowskeyringinstalled usingpipx to be used bypip. (#11589)

The inspect and installation report formats are now declared stable, and their versionhas been bumped from0 to1. (#11757)

Wheel cache behavior is restored to match previous versions, allowing thecache to find existing entries. (#11527)

Use the “venv” scheme if available to obtain prefixed lib paths. (#11598)

Deprecated a historical ambiguity in howegg fragments in URL-stylerequirements are formatted and handled.egg fragments that do not looklikePEP 508 names now produce a deprecation warning. (#11617)

Fix scripts path in isolated build environment on Debian. (#11623)

Makepipshow show the editable location if package is editable (#11638)

Stop checking thatwheel is present whenbuild-system.requiresis provided withoutbuild-system.build-backend assetuptools(which we still check for) will inject it anyway. (#11673)

Fix an issue when an already existing in-memory distribution would causeexceptions inpipinstall (#11704)

Upgrade certifi to 2022.12.7

Upgrade chardet to 5.1.0

Upgrade colorama to 0.4.6

Upgrade distro to 1.8.0

Remove pep517 from vendored packages

Upgrade platformdirs to 2.6.2

Add pyproject-hooks 1.0.0

Upgrade requests to 2.28.2

Upgrade rich to 12.6.0

Upgrade urllib3 to 1.26.14

Fixed the description of the option “--install-options” in the documentation (#10265)

Remove mention that editable installs are necessary for pip freeze to report the VCSURL. (#11675)

Clarify that the egg URL fragment is only necessary for editable VCS installs, andotherwise not necessary anymore. (#11676)

Fix entry point generation ofpip.X,pipX.Y, andeasy_install-X.Yto correctly account for multi-digit Python version segments (e.g. the “11”part of 3.11). (#11547)

Deprecate--install-options which forces pip to use the deprecatedinstallcommand ofsetuptools. (#11358)

Deprecate installation with ‘setup.py install’ when no-binary is enabled forsource distributions without ‘pyproject.toml’. (#11452)

Deprecate`--no-binary disabling the wheel cache. (#11454)

Remove--use-feature=2020-resolver opt-in flag. This was supposed to be removed in 21.0, but missed during that release cycle. (#11493)

Deprecate installation with ‘setup.py install’ when the ‘wheel’ package is absent forsource distributions without ‘pyproject.toml’. (#8559)

Remove the ability to usepiplist--outdated in combination with--format=freeze. (#9789)

Useshell=True for opening the editor withpipconfigedit. (#10716)

Use thedata-dist-info-metadata attribute fromPEP 658 to resolve distribution metadata without downloading the dist yet. (#11111)

Add an option to run the test suite with pip built as a zipapp. (#11250)

Add a--python option to allow pip to manage Python environments otherthan the one pip is installed in. (#11320)

Document the new (experimental) zipapp distribution of pip. (#11459)

Use the much faster ‘bzr co --lightweight’ to obtain a copy of a Bazaar tree. (#5444)

Fix--no-index when--index-url or--extra-index-url is specifiedinside a requirements file. (#11276)

Ensure that the candidatepip executable exists, when checking for a new version of pip. (#11309)

Ignore distributions with invalidName in metadata instead of crashing, whenusing theimportlib.metadata backend. (#11352)

Raise RequirementsFileParseError when parsing malformed requirements options that can’t be successfully parsed by shlex. (#11491)

Fix build environment isolation on some system Pythons. (#6264)

Upgrade certifi to 2022.9.24

Upgrade distlib to 0.3.6

Upgrade idna to 3.4

Upgrade pep517 to 0.13.0

Upgrade pygments to 2.13.0

Upgrade tenacity to 8.1.0

Upgrade typing_extensions to 4.4.0

Upgrade urllib3 to 1.26.12

Mention that --quiet must be used when writing the installation report to stdout. (#11357)

AvoidAttributeError when removing the setuptools-provided_distutils_hack and it is missing its implementation. (#11314)

Fix import error when reinstalling pip in user site. (#11319)

Show pip deprecation warnings by default. (#11330)

Send the pip upgrade prompt to stderr. (#11282)

Ensure that things work correctly in environments where setuptools-injecteddistutils is available by default. This is done by cooperating withsetuptools’ injection logic to ensure that pip uses thedistutils from thePython standard library instead. (#11298)

Clarify thatpipcache’s wheels-related output is about locally built wheels only. (#11300)

Remove thehtml5lib deprecated feature flag. (#10825)

Remove--use-deprecated=backtrack-on-build-failures. (#11241)

Add support to usetruststore as analternative SSL certificate verification backend. The backend can be enabled on Python3.10 and later by installingtruststore into the environment, and adding the--use-feature=truststore flag to various pip commands.

truststore differs from the current default verification backend (provided bycertifi) in it uses the operating system’s trust store, which can be bettercontrolled and augmented to better support non-standard certificates. Depending onfeedback, pip may switch to this as the default certificate verification backend inthe future. (#11082)

Add--dry-run option topipinstall, to let it print what it would install butnot actually change anything in the target environment. (#11096)

Record in wheel cache entries the URL of the original artifact that was downloadedto build the cached wheels. The record is namedorigin.json and uses the PEP 610Direct URL format. (#11137)

SupportPEP 691. (#11158)

pip’s deprecation warnings now subclass the built-inDeprecationWarning, andcan be suppressed by running the Python interpreter with-Wignore::DeprecationWarning. (#11225)

Addpipinspect command to obtain the list of installed distributions and otherinformation about the Python environment, in JSON format. (#11245)

Significantly speed up isolated environment creation, by using the samesources for pip instead of creating a standalone installation for eachenvironment. (#11257)

Add an experimental--report option to the install command to generate a JSON reportof what was installed. In combination with--dry-run and--ignore-installed itcan be used to resolve the requirements. (#53)

Fixpipinstall--pre for packages with pre-release build dependencies definedboth inpyproject.toml’sbuild-system.requires andsetup.py’ssetup_requires. (#10222)

When pip rewrites the shebang line in a script during wheel installation,update the hash and size in the correspondingRECORD file entry. (#10744)

Do not consider a.dist-info directory found inside a wheel-like zip fileas metadata for an installed distribution. A package in a wheel is (bydefinition) not installed, and is not guaranteed to work due to how a wheel isstructured. (#11217)

Useimportlib.resources to read thevendor.txt file inpipdebug.This makes the command safe for use from a zipapp. (#11248)

Make the--use-pep517 option of thedownload command apply not justto the requirements specified on the command line, but to their dependencies,as well. (#9523)

Remove reliance on the stdlib cgi module, which is deprecated in Python 3.11.

Remove html5lib.

Upgrade certifi to 2022.6.15

Upgrade chardet to 5.0.0

Upgrade colorama to 0.4.5

Upgrade distlib to 0.3.5

Upgrade msgpack to 1.0.4

Upgrade pygments to 2.12.0

Upgrade pyparsing to 3.0.9

Upgrade requests to 2.28.1

Upgrade rich to 12.5.1

Upgrade typing_extensions to 4.3.0

Upgrade urllib3 to 1.26.10

Revert#10979 since it introduced a regression in certain edge cases. (#10979)

Fix an incorrect assertion in the logging logic, that prevented the upgrade prompt from being presented. (#11136)

Properly filter out optional dependencies (i.e. extras) when checking build environment distributions. (#11112)

Change the build environment dependency checking to be opt-in. (#11116)

Allow using a pre-release version to satisfy a build requirement. This helpsmanually populated build environments to more accurately detect build-timerequirement conflicts. (#11123)

Enable theimportlib.metadata metadata implementation by default onPython 3.11 (or later). The environment variable_PIP_USE_IMPORTLIB_METADATAcan still be used to enable the implementation on 3.10 and earlier, or disableit on 3.11 (by setting it to0 orfalse).

Revert#9243 since it introduced a regression in certain edge cases. (#10962)

Fix missingREQUESTED metadata when using URL constraints. (#11079)

pipconfig now normalizes names by converting underscores into dashes. (#9330)

Start migration of distribution metadata implementation frompkg_resourcestoimportlib.metadata. The new implementation is currently not exposed inany user-facing way, but included in the code base for easier development.

Drop--use-deprecated=out-of-tree-build, according to deprecation message. (#11001)

Add option to install and uninstall commands to opt-out from running-as-root warning. (#10556)

Include Project-URLs inpipshow output. (#10799)

Improve error message whenpipconfigedit is provided an editor thatdoesn’t exist. (#10812)

Add a user interface for supplying config settings to build backends. (#11059)

Add support for Powershell autocompletion. (#9024)

Explains why specified version cannot be retrieved whenRequires-Python is not satisfied. (#9615)

Validate build dependencies when using--no-build-isolation. (#9794)

Fix conditional checks to preventpip.exe from trying to modify itself, on Windows. (#10560)

Fix uninstall editable from Windows junction link. (#10696)

Fallback to pyproject.toml-based builds ifsetup.py is present in a project, butsetuptools cannot be imported. (#10717)

When checking for conflicts in the build environment, correctly skip requirementscontaining markers that do not match the current environment. (#10883)

Disable brotli import in vendored urllib3 so brotli could be uninstalled/upgraded by pip. (#10950)

Prioritize URL credentials over netrc. (#10979)

Filter available distributions using hash declarations from constraints files. (#9243)

Fix an error when trying to uninstall packages installed as editable from a network drive. (#9452)

Fix pip install issues using a proxy due to an inconsistency in how Requests is currently handling variable precedence in session. (#9691)

Upgrade CacheControl to 0.12.11

Upgrade distro to 1.7.0

Upgrade platformdirs to 2.5.2

Removeprogress from vendored dependencies.

Upgradepyparsing to 3.0.8 for startup performance improvements.

Upgrade rich to 12.2.0

Upgrade tomli to 2.0.1

Upgrade typing_extensions to 4.2.0

Add more dedicated topic and reference pages to the documentation. (#10899)

Capitalise Y as the default for “Proceed (y/n)?” when uninstalling. (#10936)

Addscheme:// requirement to--proxy option’s description (#10951)

The wheel command now references the build interface section instead of stating the legacysetuptools behavior as the default. (#10972)

Improved usefulness ofpipconfig--help output. (#11074)

Drop the doctype check, that presented a warning for index pages that use non-compliant HTML 5. (#10903)

Downgrade distlib to 0.3.3.

Print the exception viarich.traceback, when running with--debug. (#10791)

Only calculate topological installation order, for packages that are going to be installed/upgraded.

This fixes anAssertionError that occurred when determining installation order, for a very specific combination of upgrading-already-installed-package + change of dependencies + fetching some packages from a package index. This combination was especially common in Read the Docs’ builds. (#10851)

Usehtml.parser by default, instead of falling back tohtml5lib when--use-deprecated=html5lib is not passed. (#10869)

Clarify that using per-requirement overrides disables the usage of wheels. (#9674)

Instead of failing on index pages that use non-compliant HTML 5, print a deprecation warning and fall back tohtml5lib-based parsing for now. This simplifies the migration for non-compliant index pages, by letting such indexes function with a warning. (#10847)

Accept lowercase<!doctypehtml> on index pages. (#10844)

Properly handle links parsed by html5lib, when using--use-deprecated=html5lib. (#10846)

Completely replacetox in our development workflow, withnox.

Deprecate alternative progress bar styles, leaving onlyon andoff as available choices. (#10462)

Drop support for Python 3.6. (#10641)

Disable location mismatch warnings on Python versions prior to 3.10.

These warnings were helping identify potential issues as part of the sysconfig -> distutils transition, and we no longer need to rely on reports from older Python versions for information on the transition. (#10840)

ChangedPackageFinder to parse HTML documents using the stdlibhtml.parser.HTMLParser class instead of thehtml5lib package.

For now, the deprecatedhtml5lib code remains and can be used with the--use-deprecated=html5lib command line option. However, it will be removed in a future pip release. (#10291)

Utiliserich for presenting pip’s default download progress bar. (#10462)

Present a better error message when an invalid wheel file is encountered, providing more context where the invalid wheel file is. (#10535)

Documents the--require-virtualenv flag forpipinstall. (#10588)

pipinstall<tab> autocompletes paths. (#10646)

Allow Python distributors to opt-out from or opt-in to thesysconfig installation scheme backend by settingsysconfig._PIP_USE_SYSCONFIG toTrue orFalse. (#10647)

Make it possible to deselect tests requiring cryptography package on systems where it cannot be installed. (#10686)

Start using Rich for presenting error messages in a consistent format. (#10703)

Improve presentation of errors from subprocesses. (#10705)

Forward pip’s verbosity configuration to VCS tools to control their output accordingly. (#8819)

Optimize installation order calculation to improve performance when installing requirements that form a complex dependency graph with a large amount of edges. (#10557)

When a package is requested by the user for upgrade, correctly identify that the extra-ed variant of that same package depended by another user-requested package is requesting the same package, and upgrade it accordingly. (#10613)

Prevent pip from installing yanked releases unless explicitly pinned via the== or=== operators. (#10617)

Stop backtracking on build failures, by instead surfacing them to the user and aborting immediately. This behaviour provides more immediate feedback when a package cannot be built due to missing build dependencies or platform incompatibility. (#10655)

SilenceValuefor<location>doesnotmatch warning caused by an erroneous patch in Slackware-distributed Python 3.9. (#10668)

Fix an issue where pip did not consider dependencies with and without extras to be equal (#9644)

Upgrade CacheControl to 0.12.10

Upgrade certifi to 2021.10.8

Upgrade distlib to 0.3.4

Upgrade idna to 3.3

Upgrade msgpack to 1.0.3

Upgrade packaging to 21.3

Upgrade platformdirs to 2.4.1

Add pygments 2.11.2 as a vendored dependency.

Tree-trim unused portions of vendored pygments, to reduce the distribution size.

Upgrade pyparsing to 3.0.7

Upgrade Requests to 2.27.1

Upgrade resolvelib to 0.8.1

Add rich 11.0.0 as a vendored dependency.

Tree-trim unused portions of vendored rich, to reduce the distribution size.

Add typing_extensions 4.0.1 as a vendored dependency.

Upgrade urllib3 to 1.26.8

Always refuse installing or building projects that have nopyproject.toml norsetup.py. (#10531)

Tweak running-as-root detection, to checkos.getuid if it exists, on Unix-y and non-Linux/non-MacOS machines. (#10565)

When installing projects with apyproject.toml in editable mode, and the buildbackend does not supportPEP 660, prepare metadata usingprepare_metadata_for_build_wheel instead ofsetup.pyegg_info. Also, refuseinstalling projects that only have asetup.cfg and nosetup.py norpyproject.toml. These restore the pre-21.3 behaviour. (#10573)

Restore compatibility of where configuration files are loaded from on MacOS (back toLibrary/ApplicationSupport/pip, instead ofPreferences/pip). (#10585)

Upgrade pep517 to 0.12.0

Improve deprecation warning regarding the copying of source trees when installing from a local directory. (#10128)

Suppress location mismatch warnings when pip is invoked from a Python sourcetree, soensurepip does not emit warnings on CPythonmakeinstall. (#10270)

On Python 3.10 or later, the installation scheme backend has been changed to usesysconfig. This is to anticipate the deprecation ofdistutils in Python3.10, and its scheduled removal in 3.12. For compatibility considerations, pipinstallations running on Python 3.9 or lower will continue to usedistutils. (#10358)

Remove the--build-dir option and aliases, one last time. (#10485)

In-tree builds are now the default.--use-feature=in-tree-build is nowignored.--use-deprecated=out-of-tree-build may be used temporarily to easethe transition. (#10495)

Un-deprecate source distribution re-installation behaviour. (#8711)

Replace vendored appdirs with platformdirs. (#10202)

SupportPEP 610 to detecteditable installs inpipfreeze andpiplist. Thepiplist column outputhas a newEditableprojectlocation column, and the JSON output has a neweditable_project_location field. (#10249)

pipfreeze will now always fallback to reporting the editable projectlocation when it encounters a VCS error while analyzing an editablerequirement. Before, it sometimes reported the requirement as non-editable. (#10410)

pipshow now sortsRequires andRequired-By alphabetically. (#10422)

Do not raise error when there are no files to remove withpipcachepurge/remove.Instead log a warning and continue (to log that we removed 0 files). (#10459)

When backtracking during dependency resolution, prefer the dependencies which are involved in the most recent conflict. This can significantly reduce the amount of backtracking required. (#10479)

Cache requirement objects, to improve performance reducing reparses of requirement strings. (#10550)

Support editable installs for projects that have apyproject.toml and use abuild backend that supportsPEP 660. (#8212)

When a revision is specified in a Git URL, use git’s partial clone feature to speed up source retrieval. (#9086)

Add a--debug flag, to enable a mode that doesn’t log errors and propagates them to the top level instead. This is primarily to aid with debugging pip’s crashes. (#9349)

If a host is explicitly specified as trusted by the user (via the --trusted-host option), cache HTTP responses from it in addition to HTTPS ones. (#9498)

Present a better error message, when afile: URL is not found. (#10263)

Fix the auth credential cache to allow for the case in whichthe index url contains the username, but the password comesfrom an external source, such as keyring. (#10269)

Fix double unescape of HTMLdata-requires-python anddata-yanked attributes. (#10378)

New resolver: Fixes depth ordering of packages during resolution, e.g. a dependency 2 levels deep will be ordered before a dependency 3 levels deep. (#10482)

Correctly indent metadata preparation messages in pip output. (#10524)

Remove appdirs as a vendored dependency.

Upgrade distlib to 0.3.3

Upgrade distro to 1.6.0

Patch pkg_resources to use platformdirs rather than appdirs.

Add platformdirs as a vendored dependency.

Upgrade progress to 1.6

Upgrade resolvelib to 0.8.0

Upgrade urllib3 to 1.26.7

Update links of setuptools as setuptools moved these documents. The Simple Repository link now points to PyPUG as that is the canonical place of packaging specification, and setuptools’seasy_install is deprecated. (#10430)

Create a “Build System Interface” reference section, for documenting how pip interacts with build systems. (#10497)

Fix 3.6.0 compatibility in link comparison logic. (#10280)

Modify thesysconfig.get_preferred_scheme function check to becompatible with CPython 3.10’s alphareleases. (#10252)

New resolver: When a package is specified with extras in constraints, and withextras in non-constraint requirements, the resolver now correctly identifies theconstraint’s existence and avoids backtracking. (#10233)

The source distribution re-installation feature removal has been delayed to 21.3.

pipfreeze,piplist, andpipshow no longer normalize underscore(_) in distribution names to dash (-). This is a side effect of themigration toimportlib.metadata, since the underscore-dash normalizationbehavior is non-standard and specific to setuptools. This should not affectother parts of pip (for example, when feeding thepipfreeze result backintopipinstall) since pip internally performs standard PEP 503normalization independently to setuptools.

Git version parsing is now done with regular expression to prepare for thepending upstream removal of non-PEP-440 version parsing logic. (#10117)

Re-enable the “Value for … does not match” location warnings to field a newround of feedback for thedistutils-sysconfig transition. (#10151)

Remove deprecated--find-links option inpipfreeze (#9069)

New resolver: Loosen URL comparison logic when checking for direct URL referenceequivalency. The logic includes the following notable characteristics:

• The authentication part of the URL is explicitly ignored.

• Most of the fragment part, includingegg=, is explicitly ignored. Onlysubdirectory= and hash values (e.g.sha256=) are kept.

• The query part of the URL is parsed to allow ordering differences. (#10002)

Support TOML v1.0.0 syntax inpyproject.toml. (#10034)

Added a warning message for errors caused due to Long Paths being disabled on Windows. (#10045)

Change the encoding of log file from default text encoding to UTF-8. (#10071)

Log the resolved commit SHA when installing a package from a Git repository. (#10149)

Add a warning when passing an invalid requirement topipuninstall. (#4958)

Add new subcommandpipindex used to interact with indexes, and implementpipindexversion to list available versions of a package. (#7975)

When pip is asked to uninstall a project without the dist-info/RECORD fileit will no longer traceback with FileNotFoundError,but it will provide a better error message instead, such as:

ERROR:Cannotuninstallfoobar0.1,RECORDfilenotfound.Youmightbeabletorecoverfromthisvia:'pip install --force-reinstall --no-deps foobar==0.1'.

When dist-info/INSTALLER is present and contains some useful information, the info is included in the error message instead:

ERROR:Cannotuninstallfoobar0.1,RECORDfilenotfound.Hint:Thepackagewasinstalledbyrpm.

(#8954)

Add an additional level of verbosity.--verbose (and the shorthand-v) nowcontains significantly less output, and users that need complete full debug-level outputshould pass it twice (--verbose--verbose or-vv). (#9450)

New resolver: The order of dependencies resolution has been tweaked to traversethe dependency graph in a more breadth-first approach. (#9455)

Make “yes” the default choice inpipuninstall’s prompt. (#9686)

Add a special error message when users forget the-r flag when installing. (#9915)

New resolver: A distribution’sRequires-Python metadata is now checkedbefore its Python dependencies. This makes the resolver fail quicker whenthere’s an interpreter version conflict. (#9925)

Suppress “not on PATH” warning when--prefix is given. (#9931)

Includerustc version in pip’sUser-Agent, when the system hasrustc. (#9987)

Update vendored six to 1.16.0 and urllib3 to 1.26.5 (#10043)

Correctly allow PEP 517 projects to be detected without warnings inpipfreeze. (#10080)

Strip leading slash from afile:// URL built from an path with the Windowsdrive notation. This fixes bugs where thefile:// URL cannot be correctlyused as requirement, constraint, or index URLs on Windows. (#10115)

New resolver: URL comparison logic now treatsfile://localhost/ andfile:/// as equivalent to conform to RFC 8089. (#10162)

Prefer credentials from the URL over the previously-obtained credentials from URLs of the same domain, so it is possible to use different credentials on the same index server for different--extra-index-url options. (#3931)

Fix extraction of files with utf-8 encoded paths from tars. (#7667)

Skip distutils configuration parsing on encoding errors. (#8931)

New resolver: Detect an unnamed requirement is user-specified (by building itsmetadata for the project name) so it can be correctly ordered in the resolver. (#9204)

Fixpip freeze to output packagesinstalled from gitin the correctgit+protocol://git.example.com/MyProject#egg=MyProject formatrather than the old and no longer supportedgit+git@ format. (#9822)

Fix warnings about install scheme selection for Python framework buildsdistributed by Apple’s Command Line Tools. (#9844)

Relax interpreter detection to quelch a location mismatch warning where PyPyis deliberately breaking backwards compatibility. (#9845)

Upgrade certifi to 2021.05.30.

Upgrade idna to 3.2.

Upgrade packaging to 21.0

Upgrade requests to 2.26.0.

Upgrade resolvelib to 0.7.1.

Upgrade urllib3 to 1.26.6.

Remove unused optionaltornado import in vendoredtenacity to prevent old versions of Tornado from breaking pip. (#10020)

Requiresetup.cfg-only projects to be built via PEP 517, by requiring an explicit dependency on setuptools declared in pyproject.toml. (#10031)

New resolver: Correctly exclude an already installed package if its version isknown to be incompatible to stop the dependency resolution process with a clearerror message. (#9841)

Allow ZIP to archive files with timestamps earlier than 1980. (#9910)

Emit clearer error message when a project root does not contain eitherpyproject.toml,setup.py orsetup.cfg. (#9944)

Fix detection of existing standalone pip instance for PEP 517 builds. (#9953)

Temporarily set the new “Value for … does not match” location warnings leveltoDEBUG, to hide them from casual users. This prepares pip 21.1 for CPythoninclusion, while pip maintainers digest the first intake of location mismatchissues for thedistutils-sysconfig transition. (#9912)

This change fixes a bug on Python <=3.6.1 with a Typing feature added in 3.6.2 (#9831)

Fix compatibility between distutils and sysconfig when the project name is unknown outside of a virtual environment. (#9838)

Fix Python 3.6 compatibility when a PEP 517 build requirement itself needs to bebuilt in an isolated environment. (#9878)

Start installation scheme migration fromdistutils tosysconfig. Awarning is implemented to detect differences between the two implementations toencourage user reports, so we can avoid breakages before they happen.

Add the ability for the new resolver to process URL constraints. (#8253)

Add a feature--use-feature=in-tree-build to build local projects in-placewhen installing. This is expected to become the default behavior in pip 21.3;seeInstalling from local packagesfor more information. (#9091)

Bring back the “(from versions: …)” message, that was shown on resolution failures. (#9139)

Add support for editable installs for project with only setup.cfg files. (#9547)

Improve performance when picking the best file from indexes duringpipinstall. (#9748)

Warn instead of erroring out when doing a PEP 517 build in presence of--build-option. Warn when doing a PEP 517 build in presence of--global-option. (#9774)

Fixed--target to work with--editable installs. (#4390)

Add a warning, discouraging the usage of pip as root, outside a virtual environment. (#6409)

Ignore.dist-info directories if the stem is not a valid Python distributionname, so they don’t show up in e.g.pipfreeze. (#7269)

Only query the keyring for URLs that actually trigger error 401.This prevents an unnecessary keyring unlock prompt on every pip installinvocation (even with default index URL which is not password protected). (#8090)

Prevent packages already-installed alongside with pip to be injected into anisolated build environment during build-time dependency population. (#8214)

Fixpipfreeze permission denied error in order to display an understandable error message and offer solutions. (#8418)

Correctly uninstall script files (from setuptools’scripts argument), when installed with--user. (#8733)

New resolver: When a requirement is requested both via a direct URL(req@URL) and via version specifier with extras (req[extra]), theresolver will now be able to use the URL to correctly resolve the requirementwith extras. (#8785)

New resolver: Show relevant entries from user-supplied constraint files in theerror message to improve debuggability. (#9300)

Avoid parsing version to make the version check more robust against lousilydebundled downstream distributions. (#9348)

--user is no longer suggested incorrectly when pip fails with a permissionerror in a virtual environment. (#9409)

Fix incorrect reporting onRequires-Python conflicts. (#9541)

Make wheel compatibility tag preferences more important than the build tag (#9565)

Fix pip to work with warnings converted to errors. (#9779)

SECURITY: Stop splitting on unicode separators in git references,which could be maliciously used to install a different revision on therepository. (#9827)

Update urllib3 to 1.26.4 to fix CVE-2021-28363

Remove contextlib2.

Upgrade idna to 3.1

Upgrade pep517 to 0.10.0

Upgrade vendored resolvelib to 0.7.0.

Upgrade tenacity to 7.0.0

Update “setuptools extras” link to match upstream. (#4822829F-6A45-4202-87BA-A80482DF6D4E)

Improve SSL Certificate Verification docs and--cert help text. (#6720)

Add a section in the documentation to suggest solutions to thepipfreeze permission denied issue. (#8418)

Add warning about--extra-index-url and dependency confusion (#9647)

Describe--upgrade-strategy and direct requirements explicitly; add a briefexample. (#9692)

commands: debug: Use packaging.version.parse to compare between versions. (#9461)

New resolver: Download and prepare a distribution only at the last possiblemoment to avoid unnecessary network access when the same version is alreadyinstalled locally. (#9516)

Upgrade packaging to 20.9

Drop support for Python 2. (#6148)

Remove support for legacy wheel cache entries that were created with pipversions older than 20.0. (#7502)

Remove support for VCS pseudo URLs editable requirements. It was emittingdeprecation warning since version 20.0. (#7554)

Modernise the codebase after Python 2. (#8802)

Drop support for Python 3.5. (#9189)

Remove the VCS export feature that was used only with editable VCSrequirements and had correctness issues. (#9338)

Add--ignore-requires-python support to pip download. (#1884)

New resolver: Error message shown when a wheel contains inconsistent metadatais made more helpful by including both values from the file name and internalmetadata. (#9186)

Fix a regression that madepipwheel do a VCS export instead of a VCS clonefor editable requirements. This broke VCS requirements that need the VCSinformation to build correctly. (#9273)

Fixpipdownload of editable VCS requirements that need VCS informationto build correctly. (#9337)

Upgrade msgpack to 1.0.2.

Upgrade requests to 2.25.1.

Render the unreleased pip version change notes on the news page in docs. (#9172)

Fix broken email link in docs feedback banners. (#9343)

pipwheel now verifies the built wheel contains valid metadata, and can beinstalled by a subsequentpipinstall. This can be disabled with--no-verify. (#9206)

Improve presentation of XMLRPC errors in pip search. (#9315)

Fixed hanging VCS subprocess calls when the VCS outputs a large amount of dataon stderr. Restored logging of VCS errors that was inadvertently removed in pip20.2. (#8876)

Fix error when an existing incompatibility is unable to be applied to a backtracked state. (#9180)

New resolver: Discard a faulty distribution, instead of quitting outright.This implementation is taken from 20.2.2, with a fix that always makes theresolver iterate through candidates from indexes lazily, to avoid downloadingcandidates we do not need. (#9203)

New resolver: Discard a source distribution if it fails to generate metadata,instead of quitting outright. This implementation is taken from 20.2.2, with afix that always makes the resolver iterate through candidates from indexeslazily, to avoid downloading candidates we do not need. (#9246)

Upgrade resolvelib to 0.5.4.

Revert “Skip candidate not providing valid metadata”, as that caused pip to be overeager about downloading from the package index. (#9264)

New resolver: Resolve direct and pinned (== or===) requirements firstto improve resolver performance. (#9185)

Add a mechanism to delay resolving certain packages, and use it for setuptools. (#9249)

New resolver: The “Requirement already satisfied” log is not printed only oncefor each package during resolution. (#9117)

Fix crash when logic for redacting authentication information from URLsin--help is given a list of strings, instead of a single string. (#9191)

New resolver: Correctly implement PEP 592. Do not return yanked versions froman index, unless the version range can only be satisfied by yanked candidates. (#9203)

New resolver: Make constraints also apply to package variants with extras, sothe resolver correctly avoids backtracking on them. (#9232)

New resolver: Discard a candidate if it fails to provide metadata from source,or if the provided metadata is inconsistent, instead of quitting outright. (#9246)

Update vendoring to 20.8

Update documentation to reflect that pip still uses legacy resolver by default in Python 2 environments. (#9269)

The --build-dir option has been restored as a no-op, to soften the transitionfor tools that still used it. (#9193)

Remove --unstable-feature flag as it has been deprecated. (#9133)

Add support forPEP 600: Future ‘manylinux’ Platform Tags for Portable Linux Built Distributions. (#9077)

The new resolver now resolves packages in a deterministic order. (#9100)

Add support for MacOS Big Sur compatibility tags. (#9138)

New Resolver: Rework backtracking and state management, to avoid getting stuck in an infinite loop. (#9011)

New resolver: Check version equality withpackaging.version to avoid edgecases if a wheel used different version normalization logic in its filenameand metadata. (#9083)

New resolver: Show each requirement in the conflict error message only once to reduce cluttering. (#9101)

Fix a regression that madepipwheel generate zip files of editablerequirements in the wheel directory. (#9122)

Fix ResourceWarning in VCS subprocesses (#9156)

Redact auth from URL in help message. (#9160)

New Resolver: editable installations are done, regardless of whetherthe already-installed distribution is editable. (#9169)

Upgrade certifi to 2020.11.8

Upgrade colorama to 0.4.4

Upgrade packaging to 20.7

Upgrade pep517 to 0.9.1

Upgrade requests to 2.25.0

Upgrade resolvelib to 0.5.3

Upgrade toml to 0.10.2

Upgrade urllib3 to 1.26.2

Add a section to the User Guide to cover backtracking during dependency resolution. (#9039)

Reorder and revise installation instructions to make them easier to follow. (#9131)

pipfreeze will stop filtering thepip,setuptools,distribute andwheel packages frompipfreeze output in a future version.To keep the previous behavior, users should use the new--exclude option. (#4256)

Deprecate support for Python 3.5 (#8181)

Document that certain removals can be fast tracked. (#8417)

Document that Python versions are generally supported until PyPI usage falls below 5%. (#8927)

Deprecate--find-links option inpipfreeze (#9069)

Add--exclude option topipfreeze andpiplist commands to explicitly exclude packages from the output. (#4256)

Allow multiple values for --abi and --platform. (#6121)

Add option--format to subcommandlist ofpip cache, withabspath choice to output the full path of a wheel file. (#8355)

Improve error message friendliness when an environment has packages withcorrupted metadata. (#8676)

Make thesetup.pyinstall deprecation warning less noisy. We warn onlywhensetup.pyinstall succeeded andsetup.pybdist_wheel failed, assituations where both fails are most probably irrelevant to this deprecation. (#8752)

Check the download directory for existing wheels to possibly avoidfetching metadata when thefast-deps feature is used withpipwheel andpipdownload. (#8804)

When installing a git URL that refers to a commit that is not available locallyafter git clone, attempt to fetch it from the remote. (#8815)

Include http subdirectory inpipcacheinfo andpipcachepurge commands. (#8892)

Cache package listings on index packages so they are guaranteed to stay stableduring a pip command session. This also improves performance when a index pageis accessed multiple times during the command session. (#8905)

New resolver: Tweak resolution logic to improve user experience whenuser-supplied requirements conflict. (#8924)

Support Python 3.9. (#8971)

Log an informational message when backtracking takes multiple rounds on a specific package. (#8975)

Switch to the new dependency resolver by default. (#9019)

Remove the--build-dir option, as per the deprecation. (#9049)

Propagate--extra-index-url from requirements file properly to session auth,so that keyring auth will work as expected. (#8103)

Allow specifying verbosity and quiet level via configuration filesand environment variables. Previously these options were treated asboolean values when read from there while through CLI the level can bespecified. (#8578)

Only converts Windows path to unicode on Python 2 to avoid regressions when aPOSIX environment does not configure the file system encoding correctly. (#8658)

List downloaded distributions before exitingpipdownloadwhen using the new resolver to make the behavior the same asthat on the legacy resolver. (#8696)

New resolver: Pick up hash declarations in constraints files and use them tofilter available distributions. (#8792)

Avoid polluting the destination directory by resolution artifactswhen the new resolver is used forpipdownload orpipwheel. (#8827)

New resolver: If a package appears multiple times in user specification withdifferent--hash options, only hashes that present in all specificationsshould be allowed. (#8839)

Tweak the output during dependency resolution in the new resolver. (#8861)

Correctly search for installed distributions in new resolver logic in orderto not miss packages (virtualenv packages from system-wide-packages for example) (#8963)

Do not fail in pip freeze when encountering adirect_url.json metadata filewith editable=True. Render it as a non-editablefile:// URL until moderneditable installs are standardized and supported. (#8996)

Fix devendoring instructions to explicitly state thatvendor.txt should not be removed.It is mandatory forpipdebug command.

Add documentation for ‘.netrc’ support. (#7231)

Add OS tabs for OS-specific commands. (#7311)

Add note and example on keyring support for index basic-auth (#8636)

Added initial UX feedback widgets to docs. (#8783,#8848)

Add ux documentation (#8807)

Update user docs to reflect new resolver as default in 20.3. (#9044)

Improve migration guide to reflect changes in new resolver behavior. (#9056)

Document that certain removals can be fast tracked. (#8417)

Document that Python versions are generally supported until PyPI usage falls below 5%. (#8927)

New resolver: Avoid accessing indexes when the installed candidate is preferredand considered good enough. (#8023)

Improve error message friendliness when an environment has packages withcorrupted metadata. (#8676)

Cache package listings on index packages so they are guaranteed to stay stableduring a pip command session. This also improves performance when a index pageis accessed multiple times during the command session. (#8905)

New resolver: Tweak resolution logic to improve user experience whenuser-supplied requirements conflict. (#8924)

New resolver: Correctly respectRequires-Python metadata to rejectincompatible packages in--no-deps mode. (#8758)

New resolver: Pick up hash declarations in constraints files and use them tofilter available distributions. (#8792)

New resolver: If a package appears multiple times in user specification withdifferent--hash options, only hashes that present in all specificationsshould be allowed. (#8839)

Add ux documentation (#8807)

Deprecate support for Python 3.5 (#8181)

Make thesetup.pyinstall deprecation warning less noisy. We warn onlywhensetup.pyinstall succeeded andsetup.pybdist_wheel failed, assituations where both fails are most probably irrelevant to this deprecation. (#8752)

Only attempt to use the keyring once and if it fails, don’t try again.This prevents spamming users with several keyring unlock prompts when theycannot unlock or don’t want to do so. (#8090)

Fix regression that distributions in system site-packages are not correctlyfound when a virtual environment is configured withsystem-site-packageson. (#8695)

Disable caching for range requests, which causes corrupted wheelswhen pip tries to obtain metadata using the featurefast-deps. (#8701,#8716)

Always use UTF-8 to readpyvenv.cfg to match the built-invenv. (#8717)

2020 Resolver: Correctly handle marker evaluation in constraints and excludethem if their markers do not match the current environment. (#8724)

Ignore require-virtualenv inpiplist (#8603)

Correctly find already-installed distributions with dot (.) in the nameand uninstall them when needed. (#8645)

Trace a better error message on installation failure due to invalid.datafiles in wheels. (#8654)

Fix SVN version detection for alternative SVN distributions. (#8665)

New resolver: Correctly include the base package when specified with extrasin--no-deps mode. (#8677)

Use UTF-8 to handle ZIP archive entries on Python 2 according to PEP 427, sonon-ASCII paths can be resolved as expected. (#8684)

Add details on old resolver deprecation and removal to migration documentation. (#8371)

Fix feature flag name in docs. (#8660)

Deprecate setup.py-based builds that do not generate an.egg-info directory. (#6998,#8617)

Disallow passing install-location-related arguments in--install-options. (#7309)

Add deprecation warning for invalid requirements format “base>=1.0[extra]” (#8288)

Deprecate legacy setup.py install when building a wheel failed for sourcedistributions without pyproject.toml (#8368)

Deprecate -b/--build/--build-dir/--build-directory. Its current behaviour is confusingand breaks in case different versions of the same distribution need to be built duringthe resolution process. Using the TMPDIR/TEMP/TMP environment variable, possiblycombined with --no-clean covers known use cases. (#8372)

Remove undocumented and deprecated option--always-unzip (#8408)

Log debugging information about pip, inpipinstall--verbose. (#3166)

Refine error messages to avoid showing Python tracebacks when an HTTP error occurs. (#5380)

Install wheel files directly instead of extracting them to a temp directory. (#6030)

Add a beta version of pip’s next-generation dependency resolver.

Move pip’s new resolver into beta, remove the--unstable-feature=resolver flag, and enable the--use-feature=2020-resolver flag. The new resolver issignificantly stricter and more consistent when it receivesincompatible instructions, and reduces support for certain kinds ofConstraints Files, so some workarounds and workflows maybreak. More details about how to test and migrate, and how to reportissues, atChanges to the pip dependency resolver in 20.3 (2020) . Maintainers are preparing torelease pip 20.3, with the new resolver on by default, in October. (#6536)

Introduce a new ResolutionImpossible error, raised when pip encounters un-satisfiable dependency conflicts (#8546,#8377)

Add a subcommanddebug topipconfig to list available configuration sources and the key-value pairs defined in them. (#6741)

Warn if index pages have unexpected content-type (#6754)

Allow specifying--prefer-binary option in a requirements file (#7693)

Generate PEP 376 REQUESTED metadata for user supplied requirements installedby pip. (#7811)

Warn if package url is a vcs or an archive url with invalid scheme (#8128)

Parallelize network operations inpiplist. (#8504)

Allow the new resolver to obtain dependency information through wheelslazily downloaded using HTTP range requests. To enable this feature,invokepip with--use-feature=fast-deps. (#8588)

Support--use-feature in requirements files (#8601)

Use canonical package names while looking up already installed packages. (#5021)

Fix normalizing path on Windows when installing package on another logical disk. (#7625)

The VCS commands run by pip as subprocesses don’t merge stdout and stderr anymore, improving the output parsing by subsequent commands. (#7968)

Correctly treat non-ASCII entry point declarations in wheels so they can beinstalled on Windows. (#8342)

Update author email in config and tests to reflect decommissioning of pypa-dev list. (#8454)

Headers provided by wheels in .data directories are now correctly installedinto the user-provided locations, such as--prefix, instead of the virtualenvironment pip is running in. (#8521)

Vendored htmlib5 no longer imports deprecated xml.etree.cElementTree on Python 3.

Upgrade appdirs to 1.4.4

Upgrade certifi to 2020.6.20

Upgrade distlib to 0.3.1

Upgrade html5lib to 1.1

Upgrade idna to 2.10

Upgrade packaging to 20.4

Upgrade requests to 2.24.0

Upgrade six to 1.15.0

Upgrade toml to 0.10.1

Upgrade urllib3 to 1.25.9

Add--no-input option to pip docs (#7688)

List of options supported in requirements file are extracted from source of truth,instead of being maintained manually. (#7908)

Fix pip config docstring so that the subcommands render correctly in the docs (#8072)

replace links to the old pypa-dev mailing list withhttps://mail.python.org/mailman3/lists/distutils-sig.python.org/ (#8353)

Fix example for defining multiple values for options which support them (#8373)

Add documentation for the ResolutionImpossible error that helps the user fix dependency conflicts (#8459)

Add feature flags to docs (#8512)

Document how to install package extras from git branch and source distributions. (#8576)

Correctly treat wheels containing non-ASCII file contents so they can beinstalled on Windows. (#5712)

Prompt the user for password if the keyring backend doesn’t return one (#7998)

Add GitHub issue template for reporting when the dependency resolver fails (#8207)

Revert building of local directories in place, restoring the pre-20.1behaviour of copying to a temporary directory. (#7555)

Drop parallelization frompiplist--outdated. (#8167)

Fix metadata permission issues when umask has the executable bit set. (#8164)

Avoid unnecessary message about the wheel package not being installedwhen a wheel would not have been built. Additionally, clarify the message. (#8178)

Document that pip 21.0 will drop support for Python 2.7.

Addpipcachedir to show the cache directory. (#7350)

Abort pip cache commands early when cache is disabled. (#8124)

Correctly set permissions on metadata files during wheel installation,to permit non-privileged users to read from system site-packages. (#8139)

Remove emails from AUTHORS.txt to prevent usage for spamming, and only populate names in AUTHORS.txt at time of release (#5979)

Remove deprecated--skip-requirements-regex option. (#7297)

Building of local directories is now done in place, instead of a temporarylocation containing a copy of the directory tree. (#7555)

Remove unusedtests/scripts/test_all_pip.py test script and thetests/scripts folder. (#7680)

pip now implements PEP 610, sopipfreeze has better fidelityin presence of distributions installed from Direct URL requirements. (#609)

Addpipcache command for inspecting/managing pip’s wheel cache. (#6391)

Raise error if--user and--target are used together inpipinstall (#7249)

Significantly improve performance when--find-links points to a very large HTML page. (#7729)

Indicate when wheel building is skipped, due to lack of thewheel package. (#7768)

Change default behaviour to always cache responses from trusted-host source. (#7847)

An alpha version of a new resolver is available via--unstable-feature=resolver. (#988)

Correctly freeze a VCS editable package when it is nested inside another VCS repository. (#3988)

Correctly handle%2F in URL parameters to avoid accidentally unescape theminto/. (#6446)

Reject VCS URLs with an empty revision. (#7402)

Warn when an invalid URL is passed with--index-url (#7430)

Use better mechanism for handling temporary files, when recording metadataabout installed files (RECORD) and the installer (INSTALLER). (#7699)

Correctly detect global site-packages availability of virtual environmentscreated by PyPA’s virtualenv>=20.0. (#7718)

Remove current directory fromsys.path when invoked aspython-mpip<command> (#7731)

Stop failing uninstallation, when trying to remove non-existent files. (#7856)

Prevent an infinite recursion withpipwheel when$TMPDIR is within the source directory. (#7872)

Significantly speeduppiplist--outdated by parallelizing index interaction. (#7962)

Improve Windows compatibility when detecting writability in folder. (#8013)

Update semi-supported debundling script to reflect that appdirs is vendored.

Add ResolveLib as a vendored dependency.

Upgrade certifi to 2020.04.05.1

Upgrade contextlib2 to 0.6.0.post1

Upgrade distro to 1.5.0.

Upgrade idna to 2.9.

Upgrade msgpack to 1.0.0.

Upgrade packaging to 20.3.

Upgrade pep517 to 0.8.2.

Upgrade pyparsing to 2.4.7.

Remove pytoml as a vendored dependency.

Upgrade requests to 2.23.0.

Add toml as a vendored dependency.

Upgrade urllib3 to 1.25.8.

Emphasize that VCS URLs using git, git+git and git+http are insecure due tolack of authentication and encryption (#1983)

Clarify the usage of --no-binary command. (#3191)

Clarify the usage of freeze command in the example of Using pip in your program (#7008)

Add a “Copyright” page. (#7767)

Added example of defining multiple values for options which support them (#7803)

Fix a regression in generation of compatibility tags. (#7626)

Upgrade packaging to 20.1

Rename an internal module, to avoid ImportErrors due to improper uninstallation. (#7621)

Switch to a dedicated CLI tool for vendoring dependencies.

Remove wheel tag calculation from pip and usepackaging.tags. Thisshould provide more tags ordered better than in prior releases. (#6908)

Deprecate setup.py-based builds that do not generate an.egg-info directory. (#6998)

The pip>=20 wheel cache is not retro-compatible with previous versions. Untilpip 21.0, pip will continue to take advantage of existing legacy cacheentries. (#7296)

Deprecate undocumented--skip-requirements-regex option. (#7297)

Deprecate passing install-location-related options via--install-option. (#7309)

Use literal “abi3” for wheel tag on CPython 3.x, to align with PEP 384which only defines it for this platform. (#7327)

Remove interpreter-specific major version tag e.g.cp3-none-anyfrom consideration. This behavior was not documented strictly, and thistag in particular isnot useful.Anyone with a use case can create an issue with pypa/packaging. (#7355)

Wheel processing no longer permits wheels containing more than one top-level.dist-info directory. (#7487)

Support for thegit+git@ form of VCS requirement is being deprecated andwill be removed in pip 21.0. Switch togit+https:// orgit+ssh://.git+git:// also works but its use is discouraged as it isinsecure. (#7543)

Default to doing a user install (as if--user was passed) when the mainsite-packages directory is not writeable and user site-packages are enabled. (#1668)

Warn if a path in PATH starts with tilde duringpipinstall. (#6414)

Cache wheels built from Git requirements that are considered immutable,because they point to a commit hash. (#6640)

Add option--no-python-version-warning to silence warningsrelated to deprecation of Python versions. (#6673)

Cache wheels thatpipwheel built locally, matching whatpipinstall does. This particularly helps performance in workflows wherepipwheel is used forbuilding before installing.Users desiring the original behavior can usepipwheel--no-cache-dir. (#6852)

Display CA information inpipdebug. (#7146)

Show only the filename (instead of full URL), when downloading from PyPI. (#7225)

Suggest a more robust command to upgrade pip itself to avoid confusion when thecurrent pip command is not available aspip. (#7376)

Define all old pip console script entrypoints to prevent import issues instale wrapper scripts. (#7498)

The build step ofpipwheel now builds all wheels to a cache first,then copies them to the wheel directory all at once.Before, it built them to a temporary directory and movedthem to the wheel directory one by one. (#7517)

Expand~ prefix to user directory in path options, configs, andenvironment variables. Values that may be either URL or path are notcurrently supported, to avoid ambiguity:

• --find-links

• --constraint,-c

• --requirement,-r

• --editable,-e (#980)

Correctly handle system site-packages, in virtual environments created with venv (PEP 405). (#5702,#7155)

Fix case sensitive comparison of pip freeze when used with -r option. (#5716)

Enforce PEP 508 requirement format inpyproject.tomlbuild-system.requires. (#6410)

Makeensure_dir() also ignoreENOTEMPTY as seen on Windows. (#6426)

Fix building packages which specifybackend-path in pyproject.toml. (#6599)

Do not attempt to runsetup.pyclean after apep517 build error,since asetup.py may not exist in that case. (#6642)

Fix passwords being visible in the index-url in“Downloading <url>” message. (#6783)

Change method from shutil.remove to shutil.rmtree in noxfile.py. (#7191)

Skip running tests which require subversion, when svn isn’t installed (#7193)

Fix not sending client certificates when using--trusted-host. (#7207)

Make surepipwheel never outputs pure python wheels with apython implementation tag. Better fix/workaround for#3025 byusing a per-implementation wheel cache instead of caching pure pythonwheels with an implementation tag in their name. (#7296)

Includesubdirectory URL fragments in cache keys. (#7333)

Fix typo in warning message when any of--build-option,--global-optionand--install-option is used in requirements.txt (#7340)

Fix the logging of cached HTTP response shown as downloading. (#7393)

Effectively disable the wheel cache when it is not writable, as is thecase with the http cache. (#7488)

Correctly handle relative cache directory provided via --cache-dir. (#7541)

Upgrade CacheControl to 0.12.5

Upgrade certifi to 2019.9.11

Upgrade colorama to 0.4.1

Upgrade distlib to 0.2.9.post0

Upgrade ipaddress to 1.0.22

Update packaging to 20.0.

Upgrade pkg_resources (via setuptools) to 44.0.0

Upgrade pyparsing to 2.4.2

Upgrade six to 1.12.0

Upgrade urllib3 to 1.25.6

Document that “coding: utf-8” is supported in requirements.txt (#7182)

Explain how to get pip’s source code inGetting Started (#7197)

Describe how basic authentication credentials in URLs work. (#7201)

Add more clear installation instructions (#7222)

Fix documentation links for index options (#7347)

Better document the requirements file format (#7385)

Document Python 3.8 support. (#7219)

Fix bug that prevented installation of PEP 517 packages withoutsetup.py. (#6606)

Remove undocumented support for un-prefixed URL requirements pointingto SVN repositories. Users relying on this can get the original behaviorby prefixing their URL withsvn+ (which is backwards-compatible). (#7037)

Remove the deprecated--venv option frompipconfig. (#7163)

Print a better error message when--no-binary or--only-binary is givenan argument starting with-. (#3191)

Makepipshow warn about packages not found. (#6858)

Support including a port number in--trusted-host for both HTTP and HTTPS. (#6886)

Redact single-part login credentials from URLs in log messages. (#6891)

Implement manylinux2014 platform tag support. manylinux2014 is the successorto manylinux2010. It allows carefully compiled binary wheels to be installedon compatible Linux platforms. The manylinux2014 platform tag definition canbe found inPEP599. (#7102)

Abort installation if any archive contains a file which would be placedoutside the extraction location. (#3907)

pip’s CLI completion code no longer prints a Traceback if it is interrupted. (#3942)

Correct inconsistency related to thehg+file scheme. (#4358)

Fixrmtree_errorhandler to skip non-existing directories. (#4910)

Ignore errors copying socket files for local source installs (in Python 3). (#5306)

Fix requirement line parser to correctly handle PEP 440 requirements with a URLpointing to an archive file. (#6202)

Thepip-wheel-metadata directory does not need to persist between invocations of pip, use a temporary directory instead of the currentsetup.py directory. (#6213)

Fix--trusted-host processing under HTTPS to trust any port number usedwith the host. (#6705)

Switch to newdistlib wheel script template. This should be functionallyequivalent for end users. (#6763)

Skip copying .tox and .nox directories to temporary build directories (#6770)

Fix handling of tokens (single part credentials) in URLs. (#6795)

Fix a regression that caused~ expansion not to occur in--find-linkspaths. (#6804)

Fix bypassed pip upgrade warning on Windows. (#6841)

Fix ‘m’ flag erroneously being appended to ABI tag in Python 3.8 on platforms that do not provide SOABI (#6885)

Hide security-sensitive strings like passwords in log messages related toversion control system (aka VCS) command invocations. (#6890)

Correctly uninstall symlinks that were installed in a virtualenv,by tools such asflitinstall--symlink. (#6892)

Don’t fail installation using pip.exe on Windows when pip wouldn’t be upgraded. (#6924)

Use canonical distribution names when computingRequired-By inpipshow. (#6947)

Don’t use hardlinks for locking selfcheck state file. (#6954)

Ignore “require_virtualenv” inpipconfig (#6991)

Fixpipfreeze not showing correct entry for mercurial packages that use subdirectories. (#7071)

Fix a crash whensys.stdin is set toNone, such as on AWS Lambda. (#7118,#7119)

Upgrade certifi to 2019.9.11

Add contextlib2 0.6.0 as a vendored dependency.

Remove Lockfile as a vendored dependency.

Upgrade msgpack to 0.6.2

Upgrade packaging to 19.2

Upgrade pep517 to 0.7.0

Upgrade pyparsing to 2.4.2

Upgrade pytoml to 0.1.21

Upgrade setuptools to 41.4.0

Upgrade urllib3 to 1.25.6

Document caveats for UNC paths in uninstall and add .pth unit tests. (#6516)

Add architectural overview documentation. (#6637)

Document that--ignore-installed is dangerous. (#6794)

Fix ‘m’ flag erroneously being appended to ABI tag in Python 3.8 on platforms that do not provide SOABI (#6885)

Fix handling of tokens (single part credentials) in URLs. (#6795)

Fix a regression that caused~ expansion not to occur in--find-linkspaths. (#6804)

Fix aNoneTypeAttributeError when evaluating hashes and no hashesare provided. (#6772)

Drop support for EOL Python 3.4. (#6685)

Improve deprecation messages to include the version in which the functionality will be removed. (#6549)

Credentials will now be loaded usingkeyring when installed. (#5948)

Fully support using--trusted-host inside requirements files. (#3799)

Update timestamps in pip’s--log file to include milliseconds. (#6587)

Respect whether a file has been marked as “yanked” from a simple repository(seePEP 592 for details). (#6633)

When choosing candidates to install, prefer candidates with a hash matchingone of the user-provided hashes. (#5874)

Improve the error message whenMETADATA orPKG-INFO is None whenaccessing metadata. (#5082)

Add a new commandpipdebug that can display e.g. the list of compatibletags for the current Python. (#6638)

Display hint on installing with --pre when search results include pre-release versions. (#5169)

Report to Warehouse that pip is running under CI if thePIP_IS_CI environment variable is set. (#5499)

Allow--python-version to be passed as a dotted version string (e.g.3.7 or3.7.3). (#6585)

Log the final filename and SHA256 of a.whl file when done building awheel. (#5908)

Include the wheel’s tags in the log message explanation when a candidatewheel link is found incompatible. (#6121)

Add a--path argument topipfreeze to support--targetinstallations. (#6404)

Add a--path argument topiplist to support--targetinstallations. (#6551)

Setsys.argv[0] to the underlyingsetup.py when invokingsetup.pyvia the setuptools shim so setuptools doesn’t think the path is-c. (#1890)

Updatepipdownload to respect the given--python-version when checking"Requires-Python". (#5369)

Respect--global-option and--install-option when installing froma version control url (e.g.git). (#5518)

Make the “ascii” progress bar really be “ascii” and not Unicode. (#5671)

Fail elegantly when trying to set an incorrectly formatted key in config. (#5963)

Prevent DistutilsOptionError when prefix is indicated in the global environment and--target is used. (#6008)

Fixpipinstall to respect--ignore-requires-python when evaluatinglinks. (#6371)

Fix a debug log message when freezing an editable, non-version controlledrequirement. (#6383)

Extend to Subversion 1.8+ the behavior of calling Subversion ininteractive mode when pip is run interactively. (#6386)

Preventpipinstall<url> from permitting directory traversal if e.g.a malicious server sends aContent-Disposition header with a filenamecontaining../ or..\\. (#6413)

Hide passwords in output when using--find-links. (#6489)

Include more details in the log message ifpipfreeze can’t generate arequirement string for a particular distribution. (#6513)

Add the line number and file location to the error message when reading aninvalid requirements file in certain situations. (#6527)

Preferos.confstr toctypes when extracting glibc version info. (#6543,#6675)

Improve error message printed when an invalid editable requirement is provided. (#6648)

Improve error message formatting when a command errors out in a subprocess. (#6651)

Upgrade certifi to 2019.6.16

Upgrade distlib to 0.2.9.post0

Upgrade msgpack to 0.6.1

Upgrade requests to 2.22.0

Upgrade urllib3 to 1.25.3

Patch vendored html5lib, to prefer usingcollections.abc where possible.

Document how Python 2.7 support will be maintained. (#6726)

Upgrade Sphinx version used to build documentation. (#6471)

Fix generation of subcommand manpages. (#6724)

Mention that pip can install from git refs. (#6512)

Replace a failing example of pip installs with extras with a working one. (#4733)

Restorepyproject.toml handling to how it was with pip 19.0.3 to preventthe need to add--no-use-pep517 when installing in editable mode. (#6434)

Fix a regression that caused@ to be quoted in pypiserver links.This interfered with parsing the revision string from VCS urls. (#6440)

Configuration files may now also be stored undersys.prefix (#5060)

Avoid creating an unnecessary local clone of a Bazaar branch when exporting. (#5443)

Include in pip’s User-Agent string whether it looks like pip is runningunder CI. (#5499)

A custom (JSON-encoded) string can now be added to pip’s User-Agentusing thePIP_USER_AGENT_USER_DATA environment variable. (#5549)

For consistency, passing--no-cache-dir no longer affects whether wheelswill be built. In this case, a temporary directory is used. (#5749)

Command arguments insubprocess log messages are now quoted usingshlex.quote(). (#6290)

Prefix warning and error messages in log output withWARNING andERROR. (#6298)

Using--build-options in a PEP 517 build now fails with an error,rather than silently ignoring the option. (#6305)

Error out with an informative message if one tries to install apyproject.toml-style (PEP 517) source tree using--editable mode. (#6314)

When downloading a package, the ETA and average speed now only update once per second for better legibility. (#6319)

The stdout and stderr from VCS commands run by pip as subprocesses (e.g.git,hg, etc.) no longer pollute pip’s stdout. (#1219)

Fix handling of requests exceptions when dependencies are debundled. (#4195)

Make pip’s self version check avoid recommending upgrades to prereleases if the currently-installed version is stable. (#5175)

Fixed crash when installing a requirement from a URL that comes from a dependency without a URL. (#5889)

Improve handling of file URIs: correctly handlefile://localhost/… and don’t try to use UNC paths on Unix. (#5892)

Fixutils.encoding.auto_decode()LookupError with invalid encodings.utils.encoding.auto_decode() was broken when decoding Big Endian BOMbyte-strings on Little Endian or vice versa. (#6054)

Fix incorrect URL quoting of IPv6 addresses. (#6285)

Redact the password from the extra index URL when usingpip-v. (#6295)

The spinner no longer displays a completion message after subprocess callsnot needing a spinner. It also no longer incorrectly reports an error aftercertain subprocess calls to Git that succeeded. (#6312)

Fix the handling of editable mode during installs whenpyproject.toml ispresent but PEP 517 doesn’t require the source tree to be treated aspyproject.toml-style. (#6370)

FixNameError when handling an invalid requirement. (#6419)

Updated certifi to 2019.3.9

Updated distro to 1.4.0

Update progress to 1.5

Updated pyparsing to 2.4.0

Updated pkg_resources to 41.0.1 (via setuptools)

Make dashes render correctly when displaying long options like--find-links in the text. (#6422)

Fix anIndexError crash when a legacy build of a wheel fails. (#6252)

Fix a regression introduced in 19.0.2 where the filename in a RECORD fileof an installed file would not be updated when installing a wheel. (#6266)

Fix a crash where PEP 517-based builds using--no-cache-dir would fail insome circumstances with anAssertionError due to not finalizing a builddirectory internally. (#6197)

Provide a better error message if attempting an editable install of adirectory with apyproject.toml but nosetup.py. (#6170)

The implicit default backend used for projects that provide apyproject.tomlfile without explicitly specifyingbuild-backend now behaves more like directexecution ofsetup.py, and hence should restore compatibility with projectsthat were unable to be installed withpip 19.0. This raised the minimumrequired version ofsetuptools for such builds to 40.8.0. (#6163)

AllowRECORD lines with more than three elements, and display a warning. (#6165)

AdjacentTempDirectory fails on unwritable directory instead of locking up the uninstall command. (#6169)

Make failed uninstalls roll back more reliably and better at avoiding naming conflicts. (#6194)

Ensure the correct wheel file is copied when building PEP 517 distribution is built. (#6196)

The Python 2 end of life warning now only shows on CPython, which is theimplementation that has announced end of life plans. (#6207)

Re-write README and documentation index (#5815)

Fix a crash when using --no-cache-dir with PEP 517 distributions (#6158,#6171)

Deprecate support for Python 3.4 (#6106)

Start printing a warning for Python 2.7 to warn of impending Python 2.7 End-of-life andprompt users to start migrating to Python 3. (#6148)

Remove the deprecated--process-dependency-links option. (#6060)

Remove the deprecated SVN editable detection based on dependency linksduring freeze. (#5866)

Implement PEP 517 (allow projects to specify a build backend via pyproject.toml). (#5743)

Implement manylinux2010 platform tag support. manylinux2010 is the successorto manylinux1. It allows carefully compiled binary wheels to be installedon compatible Linux platforms. (#5008)

Improve build isolation: handle.pth files, so namespace packages are correctly supported under Python 3.2 and earlier. (#5656)

Include the package name in a freeze warning if the package is not installed. (#5943)

Warn when dropping an--[extra-]index-url value that points to an existing local directory. (#5827)

Prefix pip’s--log file lines with their timestamp. (#6141)

Avoid creating excessively long temporary paths when uninstalling packages. (#3055)

Redact the password from the URL in various log messages. (#4746,#6124)

Avoid creating excessively long temporary paths when uninstalling packages. (#3055)

Avoid printing a stack trace when given an invalid requirement. (#5147)

Present 401 warning if username/password do not work for URL (#4833)

Handlerequests.exceptions.RetryError raised inPackageFinder that was causing pip to fail silently when some indexes were unreachable. (#5270,#5483)

Handle a broken stdout pipe more gracefully (e.g. when runningpiplist|head). (#4170)

Fix crash from settingPIP_NO_CACHE_DIR=yes. (#5385)

Fix crash from unparsable requirements when checking installed packages. (#5839)

Fix content type detection if a directory named like an archive is used as a package source. (#5838)

Fix listing of outdated packages that are not dependencies of installed packages inpiplist--outdated--not-required (#5737)

Fix sortingTypeError inmove_wheel_files() when installing some packages. (#5868)

Fix support for invoking pip usingpythonsrc/pip.... (#5841)

Greatly reduce memory usage when installing wheels containing large files. (#5848)

Editable non-VCS installs now freeze as editable. (#5031)

Editable Git installs without a remote now freeze as editable. (#4759)

Canonicalize sdist file names so they can be matched to a canonicalized package name passed topipinstall. (#5870)

Properly decode special characters in SVN URL credentials. (#5968)

MakePIP_NO_CACHE_DIR disable the cache also for truthy values like"true","yes","1", etc. (#5735)

Include license text of vendored 3rd party libraries. (#5213)

Update certifi to 2018.11.29

Update colorama to 0.4.1

Update distlib to 0.2.8

Update idna to 2.8

Update packaging to 19.0

Update pep517 to 0.5.0

Update pkg_resources to 40.6.3 (via setuptools)

Update pyparsing to 2.3.1

Update pytoml to 0.1.20

Update requests to 2.21.0

Update six to 1.12.0

Update urllib3 to 1.24.1

Include the Vendoring Policy in the documentation. (#5958)

Add instructions for running pip from source to Development documentation. (#5949)

Remove references to removed#egg=<name>-<version> functionality (#5888)

Fix omission of command name in HTML usage documentation (#5984)

Allow PEP 508 URL requirements to be used as dependencies.

As a security measure, pip will raise an exception when installing packages fromPyPI if those packages depend on packages not also hosted on PyPI.In the future, PyPI will block uploading packages with such external URL dependencies directly. (#4187)

Allows dist options (--abi, --python-version, --platform, --implementation) when installing with --target (#5355)

Support passingsvn+ssh URLs with a username topipinstall-e. (#5375)

pip now ensures that the RECORD file is sorted when installing from a wheel file. (#5525)

Add support for Python 3.7. (#5561)

Malformed configuration files now show helpful error messages, instead of tracebacks. (#5798)

Checkout the correct branch when doing an editable Git install. (#2037)

Run self-version-check only on commands that may access the index, instead oftrying on every run and failing to do so due to missing options. (#5433)

Allow a Git ref to be installed over an existing installation. (#5624)

Show a better error message when a configuration option has an invalid value. (#5644)

Always revalidate cached simple API pages instead of blindly caching them for up to 10minutes. (#5670)

Avoid caching self-version-check information when cache is disabled. (#5679)

Avoid traceback printing on autocomplete after flags in the CLI. (#5751)

Fix incorrect parsing of egg names if pip needs to guess the package name. (#5819)

Upgrade certifi to 2018.8.24

Upgrade packaging to 18.0

Upgrade pyparsing to 2.2.1

Add pep517 version 0.2

Upgrade pytoml to 0.1.19

Upgrade pkg_resources to 40.4.3 (via setuptools)

Fix “Requirements Files” reference in User Guide (#user_guide_fix_requirements_file_ref)

Switch to a Calendar based versioning scheme.

Formally document our deprecation process as a minimum of 6 months of deprecationwarnings.

Adopt and document NEWS fragment writing style.

Switch to releasing a new, non-bug fix version of pip every 3 months.

Remove the legacy format from pip list. (#3651, #3654)

Dropped support for Python 3.3. (#3796)

Remove support for cleaning up #egg fragment postfixes. (#4174)

Remove the shim for the old get-pip.py location. (#5520)

For the past 2 years, it’s only been redirecting users to use the newerhttps://bootstrap.pypa.io/get-pip.py location.

Introduce a new --prefer-binary flag, to prefer older wheels over newer source packages. (#3785)

Improve autocompletion function on file name completion after optionswhich have<file>,<dir> or<path> as metavar. (#4842, #5125)

Add support for installing PEP 518 build dependencies from source. (#5229)

Improve status message when upgrade is skipped due to only-if-needed strategy. (#5319)

Update pip’s self-check logic to not use a virtualenv specific file and honor cache-dir. (#3905)

Remove compiled pyo files for wheel packages. (#4471)

Speed up printing of newly installed package versions. (#5127)

Restrict install time dependency warnings to directly-dependant packages. (#5196, #5457)

Warning about the entire package set has resulted in users getting confused asto why pip is printing these warnings.

Improve handling of PEP 518 build requirements: support environment markers and extras. (#5230, #5265)

Remove username/password from log message when using index with basic auth. (#5249)

Remove trailing os.sep from PATH directories to avoid false negatives. (#5293)

Fix “pip wheel pip” being blocked by the “don’t use pip to modify itself” check. (#5311, #5312)

Disable pip’s version check (and upgrade message) when installed by a different package manager. (#5346)

This works better with Linux distributions where pip’s upgrade message mayresult in users running pip in a manner that modifies files that should bemanaged by the OS’s package manager.

Check for file existence and unlink first when clobbering existing files during a wheel install. (#5366)

Improve error message to be more specific when no files are found as listed in as listed in PKG-INFO. (#5381)

Always readpyproject.toml as UTF-8. This fixes Unicode handling on Windows and Python 2. (#5482)

Fix a crash that occurs when PATH not set, while generating script location warning. (#5558)

Disallow packages withpyproject.toml files that have an empty build-system table. (#5627)

Update CacheControl to 0.12.5.

Update certifi to 2018.4.16.

Update distro to 1.3.0.

Update idna to 2.7.

Update ipaddress to 1.0.22.

Update pkg_resources to 39.2.0 (via setuptools).

Update progress to 1.4.

Update pytoml to 0.1.16.

Update requests to 2.19.1.

Update urllib3 to 1.23.

Document how to use pip with a proxy server. (#512, #5574)

Document that the output of pip show is in RFC-compliant mail header format. (#5261)

Switch the default repository to the new “PyPI 2.0” running athttps://pypi.org/. (#5214)

Fix a bug that made get-pip.py unusable on Windows without renaming. (#5219)

Fix a TypeError when loading the cache on older versions of Python 2.7.(#5231)

Fix and improve error message when EnvironmentError occurs duringinstallation. (#5237)

A crash when reinstalling from VCS requirements has been fixed. (#5251)

Fix PEP 518 support when pip is installed in the user site. (#5524)

Upgrade distlib to 0.2.7

Prevent false-positive installation warnings due to incomplete namenormalization. (#5134)

Fix issue where installing from Git with a short SHA would fail. (#5140)

Accept pre-release versions when checking for conflicts with pip check or pipinstall. (#5141)

ioctl(fd,termios.TIOCGWINSZ,...) needs 8 bytes of data (#5150)

Do not warn about script location when installing to the directory containingsys.executable. This is the case when ‘pip install’ing without activating avirtualenv. (#5157)

Fix PEP 518 support. (#5188)

Don’t warn about script locations if--target is specified. (#5203)

Fixed line endings in CA Bundle - 10.0.0b1 was inadvertently released with Windowsline endings. (#5131)

Removed the deprecated--egg parameter topipinstall. (#1749)

Removed support for uninstalling projects which have been installed usingdistutils. distutils installed projects do not include metadata indicatingwhat files belong to that install and thus it is impossible toactuallyuninstall them rather than just remove the metadata saying they’ve beeninstalled while leaving all of the actual files behind. (#2386)

Removed the deprecated--download option topipinstall. (#2643)

Removed the deprecated --(no-)use-wheel flags topipinstall andpipwheel. (#2699)

Removed the deprecated--allow-external,--allow-all-external, and--allow-unverified options. (#3070)

Switch the default forpiplist to the columns format, and deprecate thelegacy format. (#3654, #3686)

Deprecate support for Python 3.3. (#3796)

Removed the deprecated--default-vcs option. (#4052)

Removed thesetup.pytest support from our sdist as it wasn’t beingmaintained as a supported means to run our tests. (#4203)

Dropped support for Python 2.6. (#4343)

Removed the --editable flag from pip download, as it did not make sense(#4362)

Deprecate SVN detection based on dependency links inpipfreeze. (#4449)

Move all of pip’s APIs into the pip._internal package, properly reflectingthe fact that pip does not currently have any public APIs. (#4696, #4700)

Add--progress-bar <progress_bar> topipdownload,pipinstall andpipwheel commands, to allow selecting a specific progress indicator or,to completely suppress, (for example in a CI environment) use--progress-baroff`. (#2369, #2756)

Add--no-color topip. All colored output is disabled if this flag isdetected. (#2449)

pip uninstall now ignores the absence of a requirement and prints a warning.(#3016, #4642)

Improved the memory and disk efficiency of the HTTP cache. (#3515)

Support for packages specifying build dependencies in pyproject.toml (seePEP 518). Packages whichspecify one or more build dependencies this way will be built into wheels inan isolated environment with those dependencies installed. (#3691)

pip now supports environment variable expansion in requirement files usingonly${VARIABLE} syntax on all platforms. (#3728)

Allowed combinations of -q and -v to act sanely. Then we don’t need warningsmentioned in the issue. (#4008)

Add--exclude-editable topipfreeze andpiplist to excludeeditable packages from installed package list. (#4015, #4016)

Improve the error message for the commonpipinstall./requirements.txtcase. (#4127)

Add support for the new@url syntax from PEP 508. (#4175)

Add setuptools version to the statistics sent to BigQuery. (#4209)

Report the line which caused the hash error when using requirement files.(#4227)

Add a pip config command for managing configuration files. (#4240)

Allowpipdownload to be used with a specific platform when--no-depsis set. (#4289)

Support build-numbers in wheel versions and support sorting withbuild-numbers. (#4299)

Change pip outdated to use PackageFinder in order to do the version lookup sothat local mirrors in Environments that do not have Internet connections canbe used as the Source of Truth for latest version. (#4336)

pip now retries on more HTTP status codes, for intermittent failures.Previously, it only retried on the standard 503. Now, it also retries on 500(transient failures on AWS S3), 520 and 527 (transient failures onCloudflare). (#4473)

pip now displays where it is looking for packages, if non-default locationsare used. (#4483)

Display a message to run the right command for modifying pip on Windows(#4490)

Add Man Pages for pip (#4491)

Make uninstall command less verbose by default (#4493)

Switch the default upgrade strategy to be ‘only-if-needed’ (#4500)

Installing from a local directory or a VCS URL now builds a wheel to install,rather than runningsetup.pyinstall. Wheels from these sources are notcached. (#4501)

Don’t log a warning when installing a dependency from Git if the name lookslike a commit hash. (#4507)

pip now displays a warning when it installs scripts from a wheel outside thePATH. These warnings can be suppressed using a new --no-warn-script-locationoption. (#4553)

Local Packages can now be referenced using forward slashes on Windows.(#4563)

pip show learnt a new Required-by field that lists currently installedpackages that depend on the shown package (#4564)

The command-line autocompletion enginepipshow now autocompletesinstalled distribution names. (#4749)

Change documentation theme to be in line with Python Documentation (#4758)

Add auto completion of short options. (#4954)

Run ‘setup.py develop’ inside pep518 build environment. (#4999)

pip install now prints an error message when it installs an incompatibleversion of a dependency. (#5000)

Added a way to distinguish between pip installed packages and those from thesystem package manager in ‘pip list’. Specifically, ‘pip list -v’ also showsthe installer of package if it has that meta data. (#949)

Show install locations when list command ran with “-v” option. (#979)

Allow pip to work if theGIT_DIR andGIT_WORK_TREE environmentvariables are set. (#1130)

Makepipinstall--force-reinstall not require passing--upgrade.(#1139)

Return a failing exit status whenpip install,pip download, orpipwheel is called with no requirements. (#2720)

Interactive setup.py files will no longer hang indefinitely. (#2732, #4982)

Correctly reset the terminal if an exception occurs while a progress bar isbeing shown. (#3015)

“Support URL-encoded characters in URL credentials.” (#3236)

Don’t assume sys.__stderr__.encoding exists (#3356)

Fixpipuninstall wheneasy-install.pth lacks a trailing newline.(#3741)

Keep install options in requirements.txt from leaking. (#3763)

pip no longer passes global options from one package to later packages in thesame requirement file. (#3830)

Support installing from Git refs (#3876)

Use pkg_resources to parse the entry points file to allow names with colons.(#3901)

-q specified once correctly sets logging level to WARNING, instead ofCRITICAL. Use-qqq to have the previous behavior back. (#3994)

Shell completion scripts now use correct executable names (e.g.,pip3instead ofpip) (#3997)

Changed vendored encodings fromutf8 toutf-8. (#4076)

Fixes destination directory of data_files whenpipinstall--target isused. (#4092)

Limit the disabling of requests’ pyopenssl to Windows only. Fixes“SNIMissingWarning / InsecurePlatformWarning not fixable with pip 9.0 /9.0.1” (for non-Windows) (#4098)

Support the installation of wheels with non-PEP 440 version in theirfilenames. (#4169)

Fall back to sys.getdefaultencoding() if locale.getpreferredencoding()returns None inpip.utils.encoding.auto_decode. (#4184)

Fix a bug whereSETUPTOOLS_SHIM got called incorrectly for relative pathrequirements by converting relative paths to absolute paths prior to callingthe shim. (#4208)

Return the latest version number in search results. (#4219)

Improve error message on permission errors (#4233)

Fail gracefully when/etc/image_version (or another distro version file)appears to exists but is not readable. (#4249)

Avoid importing setuptools in the parent pip process, to avoid a racecondition when upgrading one of setuptools dependencies. (#4264)

Fix for an incorrectfreeze warning message due to a package beingincluded in multiple requirements files that were passed tofreeze.Instead of warning incorrectly that the package is not installed, pip nowwarns that the package was declared multiple times and lists the name of eachrequirements file that contains the package in question. (#4293)

Generalize help text forcompile/no-compile flags. (#4316)

Handle the case when/etc is not readable by the current user by using ahardcoded list of possible names of release files. (#4320)

Fixed aNameError when attempting to catchFileNotFoundError onPython 2.7. (#4322)

Ensure USER_SITE is correctly initialised. (#4437)

Reinstalling an editable package from Git no longer assumes that themaster branch exists. (#4448)

This fixes an issue where when someone who tries to use git with pip but pipcan’t because git is not in the path environment variable. This clarifies theerror given to suggest to the user what might be wrong. (#4461)

Improve handling of text output from build tools (avoid Unicode errors)(#4486)

Fix a “No such file or directory” error when using --prefix. (#4495)

Allow commands to opt out of --require-venv. This allows pip help to workeven when the environment variable PIP_REQUIRE_VIRTUALENV is set. (#4496)

Fix warning message on mismatched versions during installation. (#4655)

pip now records installed files in a deterministic manner improvingreproducibility. (#4667)

Fix an issue wherepipinstall-e on a Git url would fail to update if abranch or tag name is specified that happens to match the prefix of thecurrentHEAD commit hash. (#4675)

Fix an issue where a variable assigned in a try clause was accessed in theexcept clause, resulting in an undefined variable error in the except clause.(#4811)

Use log levelinfo instead ofwarning when ignoring packages due toenvironment markers. (#4876)

Replaced typo mistake in subversion support. (#4908)

Terminal size is now correctly inferred when using Python 3 on Windows.(#4966)

Abort if reading configuration causes encoding errors. (#4976)

Add a--no-user option and use it when installing build dependencies.(#5085)

Upgraded appdirs to 1.4.3.

Upgraded CacheControl to 0.12.3.

Vendored certifi at 2017.7.27.1.

Vendored chardet at 3.0.4.

Upgraded colorama to 0.3.9.

Upgraded distlib to 0.2.6.

Upgraded distro to 1.2.0.

Vendored idna at idna==2.6.

Upgraded ipaddress to 1.0.18.

Vendored msgpack-python at 0.4.8.

Removed the vendored ordereddict.

Upgraded progress to 1.3.

Upgraded pyparsing to 2.2.0.

Upgraded pytoml to 0.1.14.

Upgraded requests to 2.18.4.

Upgraded pkg_resources (via setuptools) to 36.6.0.

Upgraded six to 1.11.0.

Vendored urllib3 at 1.22.

Upgraded webencodings to 0.5.1.

Added documentation on usage of --build command line option (#4262)

(#4358)

Document how to call pip from your code, including the fact that we do notprovide a Python API. (#4743)