In [1]: %matplotlib osx

In [2]: import matplotlib.pyplot as plt

In [3]: fig = plt.figure()

In [4]: timer = fig.canvas.new_timer(interval=100)

In [5]: timer.single_shot = True

In [6]: def test():
   ...:     print("TEST")
   ...:     

In [7]: timer.add_callback(test)

In [8]: timer.start()

In [9]: TEST
In [9]: 

In [9]: timer.start()
Segmentation fault: 11