virtual environment python in Windows

- pip install virtualenv

- pip install virtualenvwrapper-win
- mkvirtualenv virtualpython3

result:

C:\Users\webDev\Envs is not a directory, creating
Using base prefix 'c:\\python36'
New python executable in C:\Users\webDev\Envs\virtualpython3\Scripts\python.exe
Installing setuptools, pip, wheel...done.
(virtualpython3) webDev@WEBDEV-PC E:\doni\

source:
- https://virtualenv.pypa.io/en/stable/userguide/
- http://timmyreilly.azurewebsites.net/python-pip-virtualenv-installation-on-windows/
- https://stackoverflow.com/questions/46869528/install-python-3-6-3-in-virtualenv-using-pip-in-windows-10