为什么得到用户警告：Matplotlib当前正在使用ps，这是非GUI后端，因此无法显示该图

Question

This is not in a jupyter notebook so this is not a duplicate of this question , but my code is:

from gluoncv import model_zoo, data, utils
from matplotlib import pyplot as plt

...
plt.show()

The error I'm getting is:

/figure.py:445: UserWarning: Matplotlib is currently using ps, which is a non-GUI backend, so cannot show the figure.
  % get_backend())

I created a repl at https://repl.it/@shamoons/WelloffHarmfulMineral

If it matters, I'm using OS X. What do I need to do to get the image to show?

Answer 1

matplotlib.use('PS') and plt.show() are mutually exclusive. You need to decide:

• Do you want to show the figure on screen? Solution: Remove the line matplotlib.use('PS') .
• Do you want to use the PS backend? This seems unlikely, because there is rarely a reason to set the backend to something non-interactive unless working on a server. Anyways, solution: Replace plt.show() by plt.savefig("filname.ps") .

Answer 2

You can use

matplotlib.use("TkAgg")

instead of

matplotlib.use("PS")

when developing on MacOS.

Please note that the import should be before importing plt , like this:

import matplotlib
matplotlib.use('TkAgg')
from matplotlib import pyplot as plt