New submission from Inada Naoki <songofaca...@gmail.com>:
When stdout is redirected to file and cp65001 is used, stdout encoding is
unexpectable:
# Power Shell 6 (use cp65001 by default)
PS C:¥> python3 -c "print('おはよう')" > ps.txt
# cmd.exe
C:¥> chcp 65001
C:¥> python3 -c "print('おはよう')" > cmd.txt
Now, ps.txt is encoded by UTF-8, but cmd.txt is encoded by cp932 (ACP).
This is because:
* TextIOWrapper tries `os.device_encoding(1)`
* `os.device_encoding(1)` use GetConsoleOutputCP() without checking stdout is
console
In the example above, a console is attached when python is called from Power
Shell 6, but it is not attached when python is called from cmd.exe.
I think using GetConsoleOutputCP() for non console is abusing.
---
There is a relating issue: UTF-8 mode doesn't override stdin,stdout,stderr
encoding when console is attached.
On Unix, os.device_encoding() uses locale encoding and UTF-8 mode overrides
locale encoding. Good.
But on Windows, os.device_encoding() uses GetConsole(Output)CP(). UTF-8 mode
doesn't override it.
If we stop abusing GetConsoleOutputCP(), this issue is fixed automatically.
But if we keep using GetConsoleOutputCP() for stdout which is not a console,
UTF-8 mode should override it.
----------
components: Windows
messages: 345551
nosy: inada.naoki, paul.moore, steve.dower, tim.golden, vstinner, zach.ware
priority: normal
severity: normal
status: open
title: GetConsole(Output)CP is used even when stdin/stdout is redirected
type: behavior
versions: Python 3.8, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37275>
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