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#6647: document that catch_warnings is not thread-safe

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Andrew M. Kuchling 2010-04-02 17:48:23 +00:00
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Doc/library/warnings.rst
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@ -381,6 +381,14 @@ Available Context Managers
protected. This argument exists primarily for testing the :mod:`warnings` protected. This argument exists primarily for testing the :mod:`warnings`
module itself. module itself.
.. note::
The :class:`catch_warnings` manager works by replacing and
then later restoring the module's
:func:`showwarning` function and internal list of filter
specifications. This means the context manager is modifying
global state and therefore is not thread-safe.
.. note:: .. note::
In Python 3.0, the arguments to the constructor for In Python 3.0, the arguments to the constructor for