[issue15948] Unchecked return value of I/O functions

[Marek Šuppa]

Marek Šuppa added the comment:

Thanks for the review.

Do you think I should split it into multiple patches to make it easier to look through?

It might be that some changes are completely wrong. This is the first time I did something with cpython core code.

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<http://bugs.python.org/issue15948>
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