[docs] [issue21995] Idle: pseudofiles have no buffer attribute.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

https://docs.python.org/3/library/io.html#io.TextIOBase.buffer
"""buffer

The underlying binary buffer (a BufferedIOBase instance) that TextIOBase deals with. This is not part of the TextIOBase API and may not exist in some implementations."""

It is common to replace standard streams with StringIO.

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nosy: +serhiy.storchaka

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