python3.x和pip3安装路径不匹配问题

mac上python2.7,python3.5,python3.6共存，pip和pip3共存，真是让人很苦恼。键入 pip3 -V 得到的结果是 pip 9.0.1 from /usr/local/lib/python3.6/site-packages (python 3.6) pip 18.1 from /usr/local/lib/python3.6/site-packages/pip (py

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