Also installs the use of PIP in Python 2 and Python 3 environments __python

For learning and working needs, while installing the Python 2 and Python 3 interpreters (or Anaconda 2 and Anaconda 3) to facilitate the switch between versions, we need to install the corresponding PIP for two versions

$ sudo apt-get install python-pip
$ sudo apt-get install Python3-pip

Running PIP install can only be a Python 2.x installation library, then how to set up to implement the Python3 related library installation.

using PIP3

At the same time installed Python3 and Python2, how to use PIP.