[issue7578] Behavior of operations on a closed file object is not documented correctly

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I think we raise ValueError because that's already what 2.x does with
plain file objects. Also, it's true that it's a programming error (using
a closed file) and not really an "IO error".

Simplest would be to fix the docs for the io module, IMHO.

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