在Pycharm中调试Matplotlib：如何关闭交互模式？

Question

First of all, I am working on the Pycharm debug console and want to put a caption under my diagram. According to this answer this can be achieved by:

plt.plot([2,5,1,2]
fig = plt.figure()
fig.text(.5, .05, "text", ha="center")
plt.show()

However, this shows me the plot at first, then an empty window (after typing the second line) and nothing later.

I figured out this must be because of interactive mode of matplotlib so I turned it off using plt.ioff() in the debug session after which plt.isinteractive() returns False . Still this does not change its behaviour and shows the plot right after the plt.plot(...) command.

Weirdly enough when I put plt.ioff() in my script, it is ignored and plt.isinteractive() returns True .

import matplotlib.pyplot as plt

plt.ioff()
plt.plot([1,2,3,4,5])
print(plt.isinteractive())

My system information:

• PyCharm CE 2017.3.2
• macOS Sierra 10.12.6
• Python 3.6.3 in an Anaconda Environment

Can anyone reproduce this? Is there another way to create more complicated diagrams from the Pycharm debug console? I would prefer to not change my development environment everytime I want to plot something more complicated.

Answer 1

To answer your question: use a different (non interactive) backend:

import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt

Your code is probably not working because you created the figure instance after your plot. Try:

fig = plt.figure()
plt.plot([2,5,1,2]
fig.text(.5, .05, "text", ha="center")
plt.show()