C:\Users\Python> pip install virtualenv

    Requirement already satisfied: virtualenv in c:\python36\lib\site-packages (16.4.)

    C:\Users\Python>

[~]$ mkdir  yangtuo

[~]$ cd yangtuo/

[~/yangtuo]$ 

[~/yangtuo]$ virtualenv --no-site-packages yangtuotest

  No LICENSE.txt / LICENSE found in source

New python executable in /data/home/v_vtongyang/yangtuo/yangtuotest/bin/python

Installing setuptools, pip, wheel...

done.

[~/yangtuo]$ 

[~/yangtuo]$ source yangtuotest/bin/activate

(yangtuotest) [~/yangtuo]$

(yangtuotest) [~/yangtuo]$ deactivate

[~/yangtuo]$ 

    (testvir) C:\Users\Python\testvir\Scripts>pip install virtualenvwrapper-win

    ...

    (testvir) C:\Users\Python\testvir\Scripts>mkvirtualenv testvir2

     C:\Users\Python\Envs is not a directory, creating

    Using base prefix 'c:\\python36'

    New python executable in C:\Users\Python\Envs\testvir2\Scripts\python.exe

    Installing setuptools, pip, wheel...

    done.

    (testvir2) C:\Users\Python\testvir\Scripts>

    C:\Users\Python\testvir\Scripts>workon

    Pass a name to activate one of the following virtualenvs:

    ==============================================================================

    testvir2

    C:\Users\Python\testvir\Scripts>

(testvir2) C:\Users\Python\testvir\Scripts>deactivate.bat

    C:\Users\Python\testvir\Scripts>workon testvir2

    (testvir2) C:\Users\Python\testvir\Scripts>