How to use multiple python versions on same machine with virtulenv , for windows.

 

In this blog post we will see how to use different python versions on same machine using virtualenv. In this example we will use python 3.8.

virtualenv for python is like sandbox which completely isolates your development environment. so that you can maintain different python versions for your different projects.

1) install python 3 from here : https://www.python.org/downloads/

note: do not add this to path variable , it can create issue at later stages. Also keep note of installation path for current python installation , we would need this while creating virtulenv. 

  

2) open cmd and install virtualenv : pip install virtualenv

 

3) create a folder where you want to create your virtual env.

 

4) create a virtual env named "venv" with python3 : virtualenv venv -p C:\Python3\python.exe

 

5) start virtual env : .\venv\Scripts\activate.bat

 

6) if you have  "requirements.txt" then install your python modules from "requirements.txt" : pip install -r requirements.txt

 

7) if you wish to create "requirements.txt" : pip freeze > requirements.txt

 

8) stop current virtual env : .\venv\Scripts\deactivate.bat

Ref : https://www.c-sharpcorner.com/article/steps-to-set-up-a-virtual-environment-for-python-development/

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