Problems Stopping Matplotlib FuncAnimation

I am writing a variant of the matplotlib strip chart example. I am running matplotlib version 1.1 on Ubuntu 12.04 from Aptana Studio. I stop the animation using the close button on the plot window.

When I do that, I get the following error message:

invalid command name "182058716callit"
    while executing
"182058716callit"
    ("after" script)
Traceback (most recent call last):
  File "/home/xxxxx/Documents/Aptana Studio 3 Workspace/foot_force/plot_boxing.py", line 179, in 
    plt.show()
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 139, in show
    _show(*args, **kw)
  File "/usr/lib/pymodules/python2.7/matplotlib/backend_bases.py", line 109, in __call__
    self.mainloop()
  File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 69, in mainloop
    Tk.mainloop()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 328, in mainloop
    _default_root.tk.mainloop(n)
AttributeError: 'NoneType' object has no attribute 'tk'

Its not the end of the world. The code still runs as needed. But the error message is ugly, especially if the code is being used to demo something to a customer.

Turns out the solution is simple. FuncAnimation has a keyword call interval, which is the time between calls to your update function in milliseconds. Increase the interval and the problem goes away.