Ipython freezes after plotting with sympy plot

Question

Whenever i try to plot something and close the plot window after that, I do not return into my Ipython shell. The shell freezes. The only thing I can do is close the shell and start all over again.

from sympy import *
x = symbols('x')
expr = 2 * x
plot(expr)

Gives a nice plot. But when I close the plot window, the Ipython shell keeps waiting, apparently in a loop.

Answer 1

After searching AGAIN for some time I did find a workaround for this problem with interactive mode:

from matplotlib import interactive
interactive(True)

Thanks to joaquin who explains it here:

https://stackoverflow.com/a/8575569/9154139