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Title: gh-149819: Fix .pth files not loaded in Python subprocesses by IntentBug · Pull Request #149888 · python/cpython · GitHub

Open Graph Title: gh-149819: Fix .pth files not loaded in Python subprocesses by IntentBug · Pull Request #149888 · python/cpython

X Title: gh-149819: Fix .pth files not loaded in Python subprocesses by IntentBug · Pull Request #149888 · python/cpython

Description: After PR gh-149583 (Fix double evaluation of .pth and .site files in venvs), .pth files are no longer loaded in subprocesses started with subprocess.run([sys.executable, ...]). Root cause: main() seeds known_paths from removeduppaths() with all sys.path entries inherited from the parent process. addsitedir() then skips .pth processing for every directory already in known_paths. Fix (2 changes in Lib/site.py, +10/−6 lines): main(): call removeduppaths() for dedup but start known_paths as a fresh empty set addsitedir(): guard sys.path.append with sitedir not in sys.path to avoid duplicates when called with fresh known_paths Verification: ./python -m test test_site: 90/90 tests pass (0 failures, 6 skipped) Functional test: .pth files correctly processed in subprocess scenario with empty known_paths Functional test (unpatched): .pth files skipped when known_paths is pre-seeded — bug confirmed Closes gh-149819

Open Graph Description: After PR gh-149583 (Fix double evaluation of .pth and .site files in venvs), .pth files are no longer loaded in subprocesses started with subprocess.run([sys.executable, ...]). Root cause: main() s...

X Description: After PR gh-149583 (Fix double evaluation of .pth and .site files in venvs), .pth files are no longer loaded in subprocesses started with subprocess.run([sys.executable, ...]). Root cause: main() s...

Opengraph URL: https://github.com/python/cpython/pull/149888

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