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matplotlib.artist.allow_rasterization
matplotlib.artist.allow_rasterization(draw)- 
    
Decorator for Artist.draw method. Provides routines that run before and after the draw call. The before and after functions are useful for changing artist-dependant renderer attributes or making other setup function calls, such as starting and flushing a mixed-mode renderer.
 
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 http://matplotlib.org/2.0.2/api/_as_gen/matplotlib.artist.allow_rasterization.html