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Description
PYTHONLEGACYWINDOWSSTDIO will let Windows use old console IO forstdin andstdout, andsys.stdin.encoding will becomecp instead ofutf-8.
cpython/Lib/test/test_cmd_line.py
Lines 974 to 978 in0af61fe
| deftest_python_legacy_windows_stdio(self): | |
| code="import sys; print(sys.stdin.encoding, sys.stdout.encoding)" | |
| expected='cp' | |
| rc,out,err=assert_python_ok('-c',code,PYTHONLEGACYWINDOWSSTDIO='1') | |
| self.assertIn(expected.encode(),out) |
In this test, it setsPYTHONLEGACYWINDOWSSTDIO to1 and creates a new Python process to check ifsys.stdin.encoding iscp. However, the new process is created bysubprocess.Popen withstdin=PIPE, stdout=PIPE, thus thesys.stdin andsys.stdout will not be console IO, so their encoding is always the current console code page (cp) whetherPYTHONLEGACYWINDOWSSTDIO is set or not. So actually nothing has been tested.
Another issue with this test is that it expects the encoding to becp, but on some non-English locale Windows environments, for example, Simplified Chinese locale, it will begbk, and the test will fail.
A fix is on the way.