python virtualenv.

https://sourabhbajaj.com/mac-setup/Python/virtualenv.html

Python Virtual Environments (uoa-eresearch.github.io)

Step 3. Install Virtualenv 

In your Windows command shell prompt type in:
pip install virtualenv
Start virtualenv 
In your windows command prompt, head to your project location: 
cd my_project
 Once inside the project folder run: 
virtualenv env
Activate virtualenv 
On Windows, virtualenv (venv) creates a batch file called 
\env\Scripts\activate.bat
To activate virtualenv on Windows, and activate the script is in the Scripts folder :
\pathto\env\Scripts\activate
Example: 
C:\Users\'Username'\venv\Scripts\activate.bat
Step 4. Install VirtualEnvWrapper-win
 There are two main methods we recommend to install this batch script.
Using pip

pip install virtualenvwrapper-win
Install from source
git clone git://github.com/davidmarble/virtualenvwrapper-win.git
We then cd to the virtualenvwrapper-win folder and run: 
python setup.py install