python - pip install 不同 python 版本

py -2   -m pip install SomePackage  # default Python 2
py -2.7 -m pip install SomePackage  # specifically Python 2.7
py -3   -m pip install SomePackage  # default Python 3
py -3.4 -m pip install SomePackage  # specifically Python 3.4

https://stackoverflow.com/questions/34803040/how-to-run-pip-of-different-version-of-python-using-python-command