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)