How to put Python 3.4 matplotlib in non-interactive mode?

Question

Consider the following simple code:

import numpy as np
import matplotlib.pyplot as plt

x = np.arange(0,np.pi,0.001)
f = np.sin(x)

plt.figure(figsize=(10,10))
plt.plot(x,f)
plt.ioff()
plt.show()
plt.savefig('Sine')

Here, I want Python to save the figure after I closed the figure window. Of course, this isn't very useful, but in the original code I want to manipulate the figure graphically and then save the changes.

The above code worked fine with my last Python version (Version 2.? with Debian), but since I changed to SuSe 13.2 with Python 3.4 it simply runs the whole code without a stop.

There do exist other threads on this topic like Matplotlib python show() returns immediately but those solutions don't work for me - I tried matplotlib.interactive(False) and choosing various different backends for matplotlib (currently I'm using 'QT4Agg').

What happers when you moveplt.ioff() before plt.figure? In principle, you should call it before you create figures and maybe matplotlib for Python 3.4 is more strict on that. — oschoudhury
– oschoudhury, Commented Apr 14, 2015 at 14:15
Unfortunately, this doesn't help either. I even put matplotlib.interactive(False) in the header, without any effect. — phlegmax
– phlegmax, Commented Apr 14, 2015 at 20:29
Are you running this code within an IPython session? You should mention this in your question. — ali_m
– ali_m, Commented Apr 16, 2015 at 12:21

Tejus Prasad · Accepted Answer · 2017-10-05 02:32:13Z

7

Please use the Agg backend. It is non interactive and it solves this issue. To set a matplotlib backend you need to call use method as shown below.

import matplotlib
matplotlib.use('Agg')

answered Oct 5, 2017 at 2:32

Tejus Prasad

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1 Comment

oarfish Over a year ago

Probably not current anymore: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.

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