UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figur

问题：UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure

图像出不来，估计是matplotlib版本的原因

如果不想卸载重装matplotlib

就用以下代码代替解决。

解决办法如下：

把import matplotlib.pyplot as plt用下面这些代码代替，问题得到解决

import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt