导入matplotlib.pyplot as plt画图问题Matplotlib created a temporary config/cache directory at /tmp/matplotl

在需要使用matplotlib在py文件中画图时，导入这个包的同时可能会出现以下问题：

在import matplotlib.pyplot as plt时出现：

Matplotlib created a temporary config/cache directory at /tmp/matplotlib-4c7itqfv because the default path (/home/xx/.config/matplotlib) is not a writable directory; it is highly recommended to set the MPLConFIGDIR environment variable to a writable directory, in particular to speed up the import of Matplotlib and to better support multiprocessing.

原因不详。

解决方法：

在import matplotlib.pyplot as plt之前：

import os
os.environ['MPLCONFIGDIR'] = os.getcwd() + "/configs/"

import matplotlib.pyplot as plt