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added a note to avoid f-strings in logging #25081

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6 changes: 6 additions & 0 deletions doc/devel/contributing.rst
Original file line number Diff line number Diff line change
Expand Up @@ -455,6 +455,12 @@ Then they will receive messages like
DEBUG:matplotlib.yourmodulename:Here is some information
DEBUG:matplotlib.yourmodulename:Here is some more detailed information

Avoid using pre-computed strings (``f-strings``, ``str.format``,etc.) for logging because of security and
performance issues, and because they interfere with style handlers. For example, use ``_log.error('hello %s', 'world')`` rather than
``_log.error('hello {}'.format('world'))`` or ``_log.error(f'hello {s}')``.



Which logging level to use?
~~~~~~~~~~~~~~~~~~~~~~~~~~~

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