matplotlib.backends  matplotlib.backends.backend_mixed matplotlib.backends.backend_agg matplotlib.backends.backend_cairo matplotlib.backends.backend_gtk3agg matplotlib.backends.backend_gtk3cairo matplotlib.backends.backend_nbagg matplotlib.backends.backend_pdf matplotlib.backends.backend_pgf matplotlib.backends.backend_ps matplotlib.backends.backend_qt4agg matplotlib.backends.backend_qt4cairo matplotlib.backends.backend_qt5agg matplotlib.backends.backend_qt5cairo matplotlib.backends.backend_svg matplotlib.backends.backend_tkagg matplotlib.backends.backend_webagg matplotlib.backends.backend_wxagg 

    
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