[issue29672] `catch_warnings` context manager causes warnings to be reprinted

[Gerrit Holl]

Gerrit Holl added the comment:

I suppose this is a consequence of the change in:

http://bugs.python.org/issue4180

and although I can see why the warnings filter would be reset when entering the context manager, I don't think it is desirable to have side effects for modules that are entirely unrelated.

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<http://bugs.python.org/issue29672>
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