>>> """
==================================
Figure/Axes enter and leave events
==================================

Illustrate the figure and Axes enter and leave events by changing the
frame colors on enter and leave.
"""
... import matplotlib.pyplot as plt
... 
... 
... def on_enter_axes(event):
...     print('enter_axes', event.inaxes)
...     event.inaxes.patch.set_facecolor('yellow')
...     event.canvas.draw()
... 
... 
... def on_leave_axes(event):
...     print('leave_axes', event.inaxes)
...     event.inaxes.patch.set_facecolor('white')
...     event.canvas.draw()
... 
... 
... def on_enter_figure(event):
...     print('enter_figure', event.canvas.figure)
...     event.canvas.figure.patch.set_facecolor('red')
...     event.canvas.draw()
... 
... 
... def on_leave_figure(event):
...     print('leave_figure', event.canvas.figure)
...     event.canvas.figure.patch.set_facecolor('grey')
...     event.canvas.draw()
... 
... 
... fig, axs = plt.subplots(2, 1)
... fig.suptitle('mouse hover over figure or axes to trigger events')
... 
... fig.canvas.mpl_connect('figure_enter_event', on_enter_figure)
... fig.canvas.mpl_connect('figure_leave_event', on_leave_figure)
... fig.canvas.mpl_connect('axes_enter_event', on_enter_axes)
... fig.canvas.mpl_connect('axes_leave_event', on_leave_axes)
... 
... plt.show()
...