问题背景：
机器上同时装了python2、和python3后，导致只能用pip3了，使用pip2时提示：Fatal error in launcher: Unable to create process using '"d:\python27\python2.exe" "D:\Python27\Scripts\pip2.exe" '
解决方法：
执行 python -m pip，这种方式代替pip2，同理pip3如果失效，可以使用python3 -m pip代替pip3
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