It is a method of online search, all too much trouble, in fact, as long as these two steps can be easily resolved
1. Edit the file in the matplotlib, cancel font.famliy, before font.sans-serif #
vim /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/mpl-data/matplotlibrc
2. Rebuild the font environment
from matplotlib.font_manager import _rebuild _rebuild()
Get!