Set Matplotlib's root logger and root logger handler level, creating the handler if it does not exist yet.
Typically, one should call set_loglevel("info")
or set_loglevel("debug")
to get additional debugging information.
The log level of the handler.
The first time this function is called, an additional handler is attached to Matplotlib's root handler; this handler is reused every time and this function simply manipulates the logger and handler's level.
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https://matplotlib.org/3.5.1/api/_as_gen/matplotlib.pyplot.set_loglevel.html