windows下安置matplotlib
py -3 -m pip install matplotlib
这样安置会报错/缺少freetype和png组件/最后也没解决问题/
解决要领：
https://www.lfd.uci.edu/~gohlke/pythonlibs/#pyside
找到Matplotlib, a 2D plotting library.
安置matplotlib的必备组件：Requires , , , , , , , and optionally , , , , , , ghostscript, miktex, ffmpeg, mencoder, avconv, or imagemagick.
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