[issue42707] Python uses ANSI CP for stdio on Windows console instead of using console or OEM CP

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I think using Console codepage for stdio is better. But I am afraid about breaking existing code.
How about treating only UTF-8 and leave legacy environment as-is?

* When GetConsoleCP() returns CP_UTF8, use UTF-8 for stdin. Otherwise, use ANSI.
* When GetConsoleOutputCP() returns CP_UTF8, use UTF-8 for stdout. Otherwise, use ANSI.

This will work nice with PowerShell or cmd with `chcp 65001` in most simple cases.

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nosy: +methane

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<https://bugs.python.org/issue42707>
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