如果遇到問題：
__main__:1: UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
解決方案：
在程序中增加一條語句：
import matplotlib
matplotlib.use('TkAgg') （增加這條語句）
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【debug】Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.
UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure
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