Python Matplotlib hangs when asked to plot a second chart (after closing first chart window)

Question

Weird behaviour, I\'m sure it\'s me screwing up, but I\'d like to get to the bottom of what\'s happening:

I am running the following code to create a very simple graph

Answer 1

I had this problem when using TkAgg as the backend. After using plt.close('all') my computer froze.

The solution was to switch to a different backend. I now use Qt4Agg instead.

If you have Qt4Agg installed it is possible to switch backends by typing:

plt.switch_backend('Qt4Agg')

before plotting data