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gh-156491: Avoid KeyErrors in os._Environ.get() and __contains__() - #156492

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alexmalyshev wants to merge 2 commits into
python:mainfrom
alexmalyshev:environ-get
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gh-156491: Avoid KeyErrors in os._Environ.get() and __contains__()#156492
alexmalyshev wants to merge 2 commits into
python:mainfrom
alexmalyshev:environ-get

Switch to using a sentinel()

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succeeded Aug 27, 2026 in 6s