gh-86427: Determine the stdio encoding for every standard stream on Windows - #155416
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gh-86427: Determine the stdio encoding for every standard stream on Windows#155416serhiy-storchaka wants to merge 1 commit into
serhiy-storchaka wants to merge 1 commit into
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It was the ANSI code page instead of the encoding of the device the stream is connected to, as in 3.7. The stdio encoding is now left undefined in this mode and determined for every standard stream.
serhiy-storchaka
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ericsnowcurrently
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August 9, 2026 10:50
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PyConfig.stdio_encodingis now left undefined in the legacy Windows stdio mode, and the encoding of every standard stream is determined from the device it is connected to.sys.stdin.encodingandsys.stdout.encodingcan therefore differ, and a redirected stream uses the locale encoding.This makes the member optional, which @vstinner objected to in the issue. #155415 is the minimal fix which is suitable for backporting.