[issue20262] Convert some debugging prints in zipfile to warnings

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Benjamin just have approved it for 2.7.

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assignee:  -> serhiy.storchaka
versions: +Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20262>
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