安装完后提示：
WARNING: The scripts f2py, f2py3 and f2py3.7 are installed in '/Users/mac/Library/Python/3.7/bin' which is not on PATH.
Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
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open /Users/mac/Library/Python/3.7/bin 复制上面描述的三个文件 f2py, f2py3 and f2py3.7
- open /usr/local/bin/ 将刚刚复制的三个文件粘贴到这个路径下
- numpy库能正常使用了