[issue21763] Clarify requirements for file-like objects

[Nikolaus Rath]

Nikolaus Rath added the comment:

Maybe I'm missing some important point here, but I think that the documentation ought to tell me how I have to design a file-like object such that it fulfills all expectations of the standard library.

Yes, you can get away with less than that in many situations, but that doesn't mean that the documentation should not tell me about the full set of expectations.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21763>
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