win 10 The following required packages can not be built:freetype, png

https://wizardforcel.gitbooks.io/matplotlib-user-guide/2.html
安装不了matplotlib库,通过下面两条命令解决

python -m pip install -U pip setuptools
python -m pip install matplotlib
    原文作者:写给自己的书
    原文地址: https://www.jianshu.com/p/3bc998d77ba3
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