[issue28647] python --help: -u is misdocumented as binary mode

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> I think we need to document behavior of stdin somewhere, because current the sys.stdin documentation states:
>
>> When interactive, standard streams are line-buffered. Otherwise, they
>> are block-buffered like regular text files. You can override this value
>> with the -u command-line option.

The last sentence is wrong and should be removed from sys.stdin documentation, no?

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<https://bugs.python.org/issue28647>
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