Do basic configuration for the logging system.
This function does nothing if the root logger already has handlers
configured, unless the keyword argument *force* is set to ``True``.
It is a convenience method intended for use by simple scripts
to do one-shot configuration of the logging package.
The default behaviour is to create a StreamHandler which writes to
sys.stderr, set a formatter using the BASIC_FORMAT format string, and
add the handler to the root logger.
A number of optional keyword arguments may be specified, which can alter
the default behaviour.
filename Specifies that a FileHandler be created, using the specified
filename, rather than a StreamHandler.
filemode Specifies the mode to open the file, if filename is specified
(if filemode is unspecified, it defaults to 'a').
format Use the specified format string for the handler.
datefmt Use the specified date/time format.
style If a format string is specified, use this to specify the
type of format string (possible values '%', '{', '$', for
%-formatting, :meth:`str.format` and :class:`string.Template`
- defaults to '%').
level Set the root logger level to the specified level.
stream Use the specified stream to initialize the StreamHandler. Note
that this argument is incompatible with 'filename' - if both
are present, 'stream' is ignored.
handlers If specified, this should be an iterable of already created
handlers, which will be added to the root logger. Any handler
in the list which does not have a formatter assigned will be
assigned the formatter created in this function.
force If this keyword is specified as true, any existing handlers
attached to the root logger are removed and closed, before
carrying out the configuration as specified by the other
arguments.
encoding If specified together with a filename, this encoding is passed to
the created FileHandler, causing it to be used when the file is
opened.
errors If specified together with a filename, this value is passed to the
created FileHandler, causing it to be used when the file is
opened in text mode. If not specified, the default value is
`backslashreplace`.
formatter If specified, set this formatter instance for all involved
handlers.
If not specified, the default is to create and use an instance of
`logging.Formatter` based on arguments 'format', 'datefmt' and
'style'.
When 'formatter' is specified together with any of the three
arguments 'format', 'datefmt' and 'style', a `ValueError`
is raised to signal that these arguments would lose meaning
otherwise.
Note that you could specify a stream created using open(filename, mode)
rather than passing the filename and mode in. However, it should be
remembered that StreamHandler does not close its stream (since it may be
using sys.stdout or sys.stderr), whereas FileHandler closes its stream
when the handler is closed.
.. versionchanged:: 3.2
Added the ``style`` parameter.
.. versionchanged:: 3.3
Added the ``handlers`` parameter. A ``ValueError`` is now thrown for
incompatible arguments (e.g. ``handlers`` specified together with
``filename``/``filemode``, or ``filename``/``filemode`` specified
together with ``stream``, or ``handlers`` specified together with
``stream``.
.. versionchanged:: 3.8
Added the ``force`` parameter.
.. versionchanged:: 3.9
Added the ``encoding`` and ``errors`` parameters.
.. versionchanged:: 3.15
Added the ``formatter`` parameter.