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gh-92859: Doc: add info about logging.debug() calling basicConfig() (GH-93063) (GH-93151) 

(cherry picked from commit 2176898308)
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Miss Islington (bot) 2022-05-23 12:45:03 -07:00 committed by GitHub
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9
Doc/howto/logging.rst
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@ -178,10 +178,11 @@ following example::
raise ValueError('Invalid log level: %s' % loglevel) raise ValueError('Invalid log level: %s' % loglevel)
logging.basicConfig(level=numeric_level, ...) logging.basicConfig(level=numeric_level, ...)
The call to :func:`basicConfig` should come *before* any calls to :func:`debug`, The call to :func:`basicConfig` should come *before* any calls to
:func:`info` etc. As it's intended as a one-off simple configuration facility, :func:`debug`, :func:`info`, etc. Otherwise, those functions will call
only the first call will actually do anything: subsequent calls are effectively :func:`basicConfig` for you with the default options. As it's intended as a
no-ops. one-off simple configuration facility, only the first call will actually do
anything: subsequent calls are effectively no-ops.
If you run the above script several times, the messages from successive runs If you run the above script several times, the messages from successive runs
are appended to the file *example.log*. If you want each run to start afresh, are appended to the file *example.log*. If you want each run to start afresh,

8
Doc/library/logging.rst
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@ -242,6 +242,10 @@ is the module's name in the Python package namespace.
above example). In such circumstances, it is likely that specialized above example). In such circumstances, it is likely that specialized
:class:`Formatter`\ s would be used with particular :class:`Handler`\ s. :class:`Formatter`\ s would be used with particular :class:`Handler`\ s.
If no handler is attached to this logger (or any of its ancestors,
taking into account the relevant :attr:`Logger.propagate` attributes),
the message will be sent to the handler set on :attr:`lastResort`.
.. versionchanged:: 3.2 .. versionchanged:: 3.2
The *stack_info* parameter was added. The *stack_info* parameter was added.
@ -1038,6 +1042,10 @@ functions.
above example). In such circumstances, it is likely that specialized above example). In such circumstances, it is likely that specialized
:class:`Formatter`\ s would be used with particular :class:`Handler`\ s. :class:`Formatter`\ s would be used with particular :class:`Handler`\ s.
This function (as well as :func:`info`, :func:`warning`, :func:`error` and
:func:`critical`) will call :func:`basicConfig` if the root logger doesn't
have any handler attached.
.. versionchanged:: 3.2 .. versionchanged:: 3.2
The *stack_info* parameter was added. The *stack_info* parameter was added.