matplotlib.artist.Artist.add_callback
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Artist.add_callback(func)[source]
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Adds a callback function that will be called whenever one of the Artist's properties changes.Returns an id that is useful for removing the callback with remove_callback()later.
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Licensed under the Matplotlib License Agreement.
    https://matplotlib.org/3.0.0/api/_as_gen/matplotlib.artist.Artist.add_callback.html