[LINUX] If you try to install Python2 pip after installing Python3 pip and it is rejected

Python3 can use pip and pip3, but if you install pip3 after installing pip in Python2 It may be overwritten.

$ sudo python get-pip.py
Requirement already up-to-date: pip in /usr/local/lib/python2.7/dist-packages

If you add --ignore-installed, you will be forced to enter.

$ sudo python get-pip.py --ignore-installed
Collecting pip
  Using cached pip-9.0.1-py2.py3-none-any.whl
Installing collected packages: pip
Successfully installed pip-9.0.1

$ pip -V
pip 9.0.1 from /usr/local/lib/python2.7/dist-packages (python 2.7)
$ pip3 -V
pip 9.0.1 from /usr/local/lib/python3.5/dist-packages (python 3.5)

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