解决Font family [‘sans-serif‘] not found.Falling back to DejaVu Sans

在用python运行SVM代码的时候，控制台一直报错误：Font family [‘sans-serif‘] not found.Falling back to DejaVu Sans，找不到sans-serif字体

一、获取matplotlib的字体目录

# 在python终端中输入
import patplotlib
print(matplotlib.matplotlib_fname())

# 输出结果
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/mpl-data/matplotlibrc

二、打开字体目录

open /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/mpl-data/fonts/ttf

三、下载SimHei字体

https://www.fontpalace.com/font-download/SimHei/

将下载的字体复制进打开的目录中

四、清除matplotlib缓存

# 在python终端中
import matplotlib
matplotlib.get_cachedir()

# 输出结果
'/Users/aaa/.matplotlib'

rm -rf /Users/test/.matplotlib

五、修改配置文件

vim /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/matplotlib/mpl-data/matplotlibrc

通过查找命令查找font.family

:/font.family

# 删除前面的#号
font.family:  sans-serif

# 删除前面的#号，并在后面添加SimHei
font.serif:    SimHei, DejaVu Serif, Bitstream Vera Serif, Computer Modern Roman, New Century Schoolbook, Century Schoolbook L, Utopia, ITC Bookman, Bookman, Nimbus Roman No9 L, Times New Roman, Times, Palatino, Charter, serif

# 将True盖为False
axes.unicode_minus: False

七、重启pycharm