backends
matplotlib.backend_basesmatplotlib.backend_managersmatplotlib.backend_toolsmatplotlib.backends.backend_gtkaggmatplotlib.backends.backend_qt4aggmatplotlib.backends.backend_qt5aggmatplotlib.backends.backend_wxaggmatplotlib.backends.backend_pdfmatplotlib.backends.backend_svg
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http://matplotlib.org/2.0.2/api/index_backend_api.html
