[FIXED] 'segmentation fault python' in Mac OS Big Sur with python 2.7

Issue

I am not totally sure if the problem started when upgrading to Big Sur: I use anaconda distribution and when I use python 2.7 and plot (plot or scatter) using matplotlib, python closes and shows this message "zsh: segmentation fault python"
If instead I use Spyder 3 compiler, the message doesn't show up but neither the graph, it doesn't show anything at all.

The code can be as simple as:

import matplotlib.pyplot as plt
lx=[1,2]
ly=[1,2]
plt.scatter(lx,ly)
plt.show()

I have uninstalled all anaconda and installed again and now the message is:
"Fontconfig warning: ignoring UTF-8: not a valid region tag
zsh: segmentation fault python"

This only happens with python 2.7, and I believe it started when making some updates on Big Sur OS. When I open python 3.8 or 3.7 (or Spyder 4) there is no problem, all works fine.

Anaconda and Mac OS itself has recommended many times to upgrade to python 3.8, but I have worked so long with 2.7 and wish if I could stay some more time with my original codes and programs. \

I would like to know if this problem is because of the OS upgrade or if it is something else.

PD: I have updated matplotlib with Conda, everything looks updated (matplotlib: 2.2.3) Also have uninstalled and reinstalled anaconda. It doesn't work with python 2.7 on Big Sur

Solution

Try uninstalling anaconda and running with the default python 2.7.16 that comes with Big Sur.

I had a similar segmentation issue just From import matplotlib.pyplot as plt.

When I uninstalled anaconda the error solved.

Answered By - Sebastián Caicedo-Dávila