[issue17859] improve error message for saving ints to file

[R. David Murray]

R. David Murray added the comment:

Éric, print doesn't help if one is writing binary data.  

What do you mean by not understanding the first message?  If you are agreeing that the first error message in Anatoly's initial post isn't clear, does Ezio's proposed change make it clearer?

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nosy: +r.david.murray

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17859>
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