[issue41003] test_copyreg: importing numpy changes warnings filters

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The issue can be replaced by a fake numpy module:

$ cat Lib/numpy.py 
import warnings
warnings.simplefilter('ignore', UserWarning)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41003>
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