gh-150167: Make shutil compression probes eager#150279
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Please, don't open PRs when there is still no concrete plan on the issue already. We are still discussing what to do. More importantly, read https://devguide.python.org/ for future contributions especially https://devguide.python.org/getting-started/ai-tools/index.html. |
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gh-150167
Make
shutildetect compression-module support eagerly even when Python starts with-X lazy_imports=all.This keeps
_BZ2_SUPPORTEDaccurate whenbz2imports successfully but its_bz2backend would fail once reified. The support probe now temporarily disables lazy imports while importing the compression module, and the regression test exercises that failure mode in a subprocess.Testing
./python.exe -m test test_shutil./python.exe -m test test_lazy_import./python.exe -X lazy_imports=all -S -c "import sys; sys.path.insert(0, TMPDIR); import shutil; print(shutil._BZ2_SUPPORTED)"(with a fakebz2module whose_bz2backend raisesImportError)