matplotlib.axes.Axes.add_callback
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Axes.add_callback(self, func)
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Add a callback function that will be called whenever one of the Artist's properties changes.Parameters: - 
funccallable
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The callback function. It must have the signature: def func(artist: Artist) -> Any where artist is the calling Artist. Return values may exist but are ignored.
 Returns: - int
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The observer id associated with the callback. This id can be used for removing the callback with remove_callbacklater.
 See also 
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Examples using matplotlib.axes.Axes.add_callback
 
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    https://matplotlib.org/3.3.3/api/_as_gen/matplotlib.axes.Axes.add_callback.html