python中plt.show()无法显示图片问题

问题描述：

出现以下情况

UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
  % get_backend())

解决办法，导入下边这个matplotlib.use('TkAgg')语句就可以了

import matplotlib; matplotlib.use('TkAgg')