Serhiy Storchaka added the comment:
It works in usual circumstances.
>>> import warnings
>>> with warnings.catch_warnings(record=True) as w:
... warnings.simplefilter('always')
... warnings.warn('a test warning', DeprecationWarning)
... print(w)
...
[<warnings.WarningMessage object at 0xb6f1714c>]
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28897>
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