gh-146310: Fix ensurepip to treat empty WHEEL_PKG_DIR as unset#146357

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kimimgo wants to merge 1 commit intopython:mainfrom

kimimgo:fix/ensurepip-empty-wheel-pkg-dir-146310

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gh-146310: Fix ensurepip to treat empty WHEEL_PKG_DIR as unset#146357
kimimgo wants to merge 1 commit intopython:mainfrom
kimimgo:fix/ensurepip-empty-wheel-pkg-dir-146310

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kimimgo commentedMar 24, 2026•
edited by bedevere-appbot
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Fixes#146310

Path('') resolves to the current working directory (PosixPath('.')), so whenWHEEL_PKG_DIR is an empty string (notNone),ensurepip searches CWD for wheel files. This can cause unexpected behavior or crashes if CWD contains files matchingpip-*.whl.

Changes

Lib/ensurepip/__init__.py: Add truthiness check so empty strings are treated the same asNone
Lib/test/test_ensurepip.py: Add test verifying emptyWHEEL_PKG_DIR does not search CWD

Before/After

# Before: Path('').resolve() -> PosixPath('/current/working/dir')# Empty string was treated as a valid directory path# After: Empty string treated as None -> use bundled wheel

Issue:ensurepip looks for wheels in CWD when WHEEL_PKG_DIR is an empty string #146310

pythongh-146310: Fix ensurepip to treat empty WHEEL_PKG_DIR as unset

ca5ccee

Path('') resolves to CWD, so an empty WHEEL_PKG_DIR string causedensurepip to search the current working directory for wheel files.Add a truthiness check to treat empty strings the same as None.