[issue21995] Idle: review 'missing' attributes of pseudofiles

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I changed title to 'review' (TextIOBase doc and StringIO as a pure text implementation).

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title: Idle: pseudofiles have no buffer attribute. -> Idle: review 'missing' attributes of pseudofiles
versions: +Python 3.9 -Python 2.7, Python 3.4, Python 3.5

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