_get_plot_backend(backend: 'str | None' = None)
The plotting system of pandas uses matplotlib by default, but the idea here is that it can also work with other third-party backends. This function returns the module which provides a top-level :None:None:`.plot` method that will actually do the plotting. The backend is specified from a string, which either comes from the keyword argument :None:None:`backend`, or, if not specified, from the option :None:None:`pandas.options.plotting.backend`. All the rest of the code in this file uses the backend specified there for the plotting.
The backend is imported lazily, as matplotlib is a soft dependency, and pandas can be used without it being installed.
Modifies :None:None:`_backends` with imported backend as a side effect.
Return the plotting backend to use (e.g. pandas.plotting._matplotlib
).
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