RuntimeWarning: More than 20 figures have been opened.
循环中创建太多plt对象，在每个循环中加入上面两句 ...
原文：Matplotlib - RuntimeWarning: More than 20 figures have been opened.
RuntimeWarning: More than figures have been opened. Figures created through the pyplot interface matplotlib.pyplot.figure are retained until explicitly closed and may consume too much memory. To contr ...
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