This is a list of python modules in the standard library as of Python 3.6.

• __future__: Future statement definitions
• __main__: The environment where the top-level script is run.
• _dummy_thread: Drop-in replacement for the _thread module.
• _thread: Low-level threading API.
• abc: Abstract base classes according to PEP 3119.
• aifc: Read and write audio files in AIFF or AIFC format.
• argparse: Command-line option and argument parsing library.
• array: Space efficient arrays of uniformly typed numeric values.
• ast: Abstract Syntax Tree classes and manipulation.
• asynchat: Support for asynchronous command/response protocols.
• asyncio: Asynchronous I/O, event loop, coroutines and tasks.
• asyncore: A base class for developing asynchronous socket handling services.
• atexit: Register and execute cleanup functions.
• audioop: Manipulate raw audio data.
• base64:RFC 3548: Base16, Base32, Base64 Data Encodings; Base85 and Ascii85
• bdb: Debugger framework.
• binascii: Tools for converting between binary and various ASCII-encoded binary representations.
• binhex: Encode and decode files in binhex4 format.
• bisect: Array bisection algorithms for binary searching.
• builtins: The module that provides the built-in namespace.
• bz2: Interfaces for bzip2 compression and decompression.
• calendar: Functions for working with calendars, including some emulation of the Unix cal program.
• cgi: Helpers for running Python scripts via the Common Gateway Interface.
• cgitb: Configurable traceback handler for CGI scripts.
• chunk: Module to read IFF chunks.
• cmath: Mathematical functions for complex numbers.
• cmd: Build line-oriented command interpreters.
• code: Facilities to implement read-eval-print loops.
• codecs: Encode and decode data and streams.
• codeop: Compile (possibly incomplete) Python code.
• collections: Container datatypes
• colorsys: Conversion functions between RGB and other color systems.
• compileall: Tools for byte-compiling all Python source files in a directory tree.
• concurrent:
• configparser: Configuration file parser.
• contextlib: Utilities for with-statement contexts.
• copy: Shallow and deep copy operations.
• copyreg: Register pickle support functions.
• cProfile
• crypt (Unix): The crypt() function used to check Unix passwords.
• csv: Write and read tabular data to and from delimited files.
• ctypes: A foreign function library for Python.
• curses (Unix): An interface to the curses library, providing portable terminal handling.
• datetime: Basic date and time types.
• dbm: Interfaces to various Unix "database" formats.
• decimal: Implementation of the General Decimal Arithmetic Specification.
• difflib: Helpers for computing differences between objects.
• dis: Disassembler for Python bytecode.
• distutils: Support for building and installing Python modules into an existing Python installation.
• doctest: Test pieces of code within docstrings.
• dummy_threading: Drop-in replacement for the threading module.
• email: Package supporting the parsing, manipulating, and generating email messages.
• encodings:
• ensurepip: Bootstrapping the "pip" installer into an existing Python installation or virtual environment.
• enum: Implementation of an enumeration class.
• errno: Standard errno system symbols.
• faulthandler: Dump the Python traceback.
• fcntl (Unix): The fcntl() and ioctl() system calls.
• filecmp: Compare files efficiently.
• fileinput: Loop over standard input or a list of files.
• fnmatch: Unix shell style filename pattern matching.
• formatter: Deprecated: Generic output formatter and device interface.
• fpectl (Unix): Provide control for floating point exception handling.
• fractions: Rational numbers.
• ftplib: FTP protocol client (requires sockets).
• functools: Higher-order functions and operations on callable objects.
• gc: Interface to the cycle-detecting garbage collector.
• getopt: Portable parser for command line options; support both short and long option names.
• getpass: Portable reading of passwords and retrieval of the userid.
• gettext: Multilingual internationalization services.
• glob: Unix shell style pathname pattern expansion.
• grp (Unix): The group database (getgrnam() and friends).
• gzip: Interfaces for gzip compression and decompression using file objects.
• hashlib: Secure hash and message digest algorithms.
• heapq: Heap queue algorithm (a.k.a. priority queue).
• hmac: Keyed-Hashing for Message Authentication (HMAC) implementation
• html: Helpers for manipulating HTML.
• http: HTTP status codes and messages
• imaplib: IMAP4 protocol client (requires sockets).
• imghdr: Determine the type of image contained in a file or byte stream.
• imp: Deprecated: Access the implementation of the import statement.
• importlib: The implementation of the import machinery.
• inspect: Extract information and source code from live objects.
• io: Core tools for working with streams.
• ipaddress: IPv4/IPv6 manipulation library.
• itertools: Functions creating iterators for efficient looping.
• json: Encode and decode the JSON format.
• keyword: Test whether a string is a keyword in Python.
• lib2to3: the 2to3 library
• linecache: This module provides random access to individual lines from text files.
• locale: Internationalization services.
• logging: Flexible event logging system for applications.
• lzma: A Python wrapper for the liblzma compression library.
• macpath: Mac OS 9 path manipulation functions.
• mailbox: Manipulate mailboxes in various formats
• mailcap: Mailcap file handling.
• marshal: Convert Python objects to streams of bytes and back (with different constraints).
• math: Mathematical functions (sin() etc.).
• mimetypes: Mapping of filename extensions to MIME types.
• mmap: Interface to memory-mapped files for Unix and Windows.
• modulefinder: Find modules used by a script.
• msilib (Windows): Creation of Microsoft Installer files, and CAB files.
• msvcrt (Windows): Miscellaneous useful routines from the MS VC++ runtime.
• multiprocessing: Process-based parallelism.
• netrc: Loading of .netrc files.
• nis (Unix): Interface to Sun's NIS (Yellow Pages) library.
• nntplib: NNTP protocol client (requires sockets).
• numbers: Numeric abstract base classes (Complex, Real, Integral, etc.).
• operator: Functions corresponding to the standard operators.
• optparse: Deprecated: Command-line option parsing library.
• os: Miscellaneous operating system interfaces.
• ossaudiodev (Linux, FreeBSD): Access to OSS-compatible audio devices.
• parser: Access parse trees for Python source code.
• pathlib: Object-oriented filesystem paths
• pdb: The Python debugger for interactive interpreters.
• pickle: Convert Python objects to streams of bytes and back.
• pickletools: Contains extensive comments about the pickle protocols and pickle-machine opcodes, as well as some useful functions.
• pipes (Unix): A Python interface to Unix shell pipelines.
• pkgutil: Utilities for the import system.
• platform: Retrieves as much platform identifying data as possible.
• plistlib: Generate and parse Mac OS X plist files.
• poplib: POP3 protocol client (requires sockets).
• posix (Unix): The most common POSIX system calls (normally used via module os).
• pprint: Data pretty printer.
• profile: Python source profiler.
• pstats: Statistics object for use with the profiler.
• pty (Linux): Pseudo-Terminal Handling for Linux.
• pwd (Unix): The password database (getpwnam() and friends).
• py_compile: Generate byte-code files from Python source files.
• pyclbr: Supports information extraction for a Python class browser.
• pydoc: Documentation generator and online help system.
• queue: A synchronized queue class.
• quopri: Encode and decode files using the MIME quoted-printable encoding.
• random: Generate pseudo-random numbers with various common distributions.
• re: Regular expression operations.
• readline (Unix): GNU readline support for Python.
• reprlib: Alternate repr() implementation with size limits.
• resource (Unix): An interface to provide resource usage information on the current process.
• rlcompleter: Python identifier completion, suitable for the GNU readline library.
• runpy: Locate and run Python modules without importing them first.
• sched: General purpose event scheduler.
• secrets: Generate secure random numbers for managing secrets.
• select: Wait for I/O completion on multiple streams.
• selectors: High-level I/O multiplexing.
• shelve: Python object persistence.
• shlex: Simple lexical analysis for Unix shell-like languages.
• shutil: High-level file operations, including copying.
• signal: Set handlers for asynchronous events.
• site: Module responsible for site-specific configuration.
• smtpd: A SMTP server implementation in Python.
• smtplib: SMTP protocol client (requires sockets).
• sndhdr: Determine type of a sound file.
• socket: Low-level networking interface.
• socketserver: A framework for network servers.
• spwd (Unix): The shadow password database (getspnam() and friends).
• sqlite3: A DB-API 2.0 implementation using SQLite 3.x.
• ssl: TLS/SSL wrapper for socket objects
• stat: Utilities for interpreting the results of os.stat(), os.lstat() and os.fstat().
• statistics: mathematical statistics functions
• string: Common string operations.
• stringprep: String preparation, as perRFC 3453
• struct: Interpret bytes as packed binary data.
• subprocess: Subprocess management.
• sunau: Provide an interface to the Sun AU sound format.
• symbol: Constants representing internal nodes of the parse tree.
• symtable: Interface to the compiler's internal symbol tables.
• sys: Access system-specific parameters and functions.
• sysconfig: Python's configuration information
• syslog (Unix): An interface to the Unix syslog library routines.
• tabnanny: Tool for detecting white space related problems in Python source files in a directory tree.
• tarfile: Read and write tar-format archive files.
• telnetlib: Telnet client class.
• tempfile: Generate temporary files and directories.
• termios (Unix): POSIX style tty control.
• test: Regression tests package containing the testing suite for Python.
• textwrap: Text wrapping and filling
• threading: Thread-based parallelism.
• time: Time access and conversions.
• timeit: Measure the execution time of small code snippets.
• tkinter: Interface to Tcl/Tk for graphical user interfaces
• token: Constants representing terminal nodes of the parse tree.
• tokenize: Lexical scanner for Python source code.
• trace: Trace or track Python statement execution.
• traceback: Print or retrieve a stack traceback.
• tracemalloc: Trace memory allocations.
• tty (Unix): Utility functions that perform common terminal control operations.
• turtle: An educational framework for simple graphics applications
• turtledemo: A viewer for example turtle scripts
• types: Names for built-in types.
• typing: Support for type hints (see PEP 484).
• unicodedata: Access the Unicode Database.
• unittest: Unit testing framework for Python.
• urllib:
• uu: Encode and decode files in uuencode format.
• uuid: UUID objects (universally unique identifiers) according toRFC 4122
• venv: Creation of virtual environments.
• warnings: Issue warning messages and control their disposition.
• wave: Provide an interface to the WAV sound format.
• weakref: Support for weak references and weak dictionaries.
• webbrowser: Easy-to-use controller for Web browsers.
• winreg (Windows): Routines and objects for manipulating the Windows registry.
• winsound (Windows): Access to the sound-playing machinery for Windows.
• wsgiref: WSGI Utilities and Reference Implementation.
• xdrlib: Encoders and decoders for the External Data Representation (XDR).
• xml: Package containing XML processing modules
• zipapp: Manage executable python zip archives
• zipfile: Read and write ZIP-format archive files.
• zipimport: support for importing Python modules from ZIP archives.
• zlib: Low-level interface to compression and decompression routines compatible with gzip.

• Book:Python Programming

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