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Add a note about -W vs filterwarnings. (#10713) 

Closes #10687

Signed-off-by: mvashishtha <mahesh@ponder.io>
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Mahesh Vashishtha 2023-02-07 16:27:34 -06:00 committed by GitHub
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doc/en/how-to/capture-warnings.rst
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@ -109,6 +109,18 @@ When a warning matches more than one option in the list, the action for the last
is performed. is performed.
.. note::
The ``-W`` flag and the ``filterwarnings`` ini option use warning filters that are
similar in structure, but each configuration option interprets its filter
differently. For example, *message* in ``filterwarnings`` is a string containing a
regular expression that the start of the warning message must match,
case-insensitively, while *message* in ``-W`` is a literal string that the start of
the warning message must contain (case-insensitively), ignoring any whitespace at
the start or end of message. Consult the `warning filter`_ documentation for more
details.
.. _`filterwarnings`: .. _`filterwarnings`:
``@pytest.mark.filterwarnings`` ``@pytest.mark.filterwarnings``