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Clarify a guarantee of the logging module. (GH-19132)

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When no additional arguments are passed to logging.debug() and related
methods, no % operation is performed on the passed in message.
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Gregory P. Smith 2020-03-24 09:48:32 -07:00 committed by GitHub
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Doc/library/logging.rst
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@ -159,6 +159,7 @@ is the module's name in the Python package namespace.
message format string, and the *args* are the arguments which are merged into
*msg* using the string formatting operator. (Note that this means that you can
use keywords in the format string, together with a single dictionary argument.)
No % formatting operation is performed on *msg* when no *args* are supplied.
There are four keyword arguments in *kwargs* which are inspected:
*exc_info*, *stack_info*, *stacklevel* and *extra*.