[issue21225] io.py: Improve docstrings for classes

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6e23afdee4e4 by Andrew Kuchling in branch '2.7':
#21225: copy docstrings from base classes
http://hg.python.org/cpython/rev/6e23afdee4e4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21225>
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