What to do when matplotlib gets angry on CentOS saying "I'm using Agg so I can't issue a figure"
phenomenon
Run this code on CentOS.
test.py
import matplotlib.pyplot as plt
plt.plot([1,2,3])
plt.show()
Then I get this error.
$ python3 test.py
test.py:3: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
plt.show()
Countermeasures
Install tkinter.
sudo yum install python3-tkinter
Then, after that, the graph is displayed properly.
$ python3 test.py
Cause
By default, Python 3 on CentOS only includes non-GUI Agg. If you include tkinter, the GUI-backend TkAgg will be enabled and you will be able to use it.
By the way, depending on the article
import matplotlib
matplotlib.use('TkAgg')
It is written that it is necessary to explicitly specify TkAgg like, but in my environment (CentOS Linux release 7.8.2003), just insert python3-tkinter (X is valid) It seems that it will be used automatically.
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