Now
pip -V
shows that it's python3.5's pip.
What to do if I want python2's package?
You can use $pip2 install [package name] as it says in the comments but down the road your life will be much easier if you use virtual environments to compartmentalize your code. That way you specify which python version to use in your project only once (at the beginning) and then you can configure pip to always install packages for that version.
pip2 install <pkg-name>