Florent Xicluna added the comment:

Much simpler:

$ ./python -Wd

import warnings
import sys
saved = warnings.filters.copy()

del sys.modules['warnings']
import warnings

assert warnings.filters != saved
assert warnings.filters.pop(0) = warnings.filters[0]
assert warnings.filters == saved

Explanation: the "default" filter is duplicated on each reload of the warnings 
module.

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<http://bugs.python.org/issue18383>
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