How to run pip of different version of python using python command?
Question: I'm now currently using Python on ubuntu 15.10

But in my OS, I have many different python version installed:

  * Python (2.7.9) 
  * Python3 (3.4.3)
  * Python3.5
  * PyPy

So, I got mess about the version of their package environment, for example, if
I run:

    
    
    pip3 install django
    

In fact I cannot import django inside `python3.5`.

Is there any efficiently way to call the relating version of `pip`?

_PS: Don't let me use virtualenv, I know about it and is finding another
solution._


Answer: Finally I found the solution myself, see the Docs:

<https://docs.python.org/3/installing/index.html?highlight=pip#work-with-
multiple-versions-of-python-installed-in-parallel>

Just call:

    
    
    pythonXX -m pip install SomePackage
    

That would work separately for each version of installed python.

Also, according to the docs, if we want to do the same thing in windows, the
command is a bit different:

    
    
    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
    

