Use virtual environments. They allow you to use isolated python instances with different set of packages. Python 3 comes with venv
module that lets you create one using
python -m venv venv
venv\Scripts\activate.bat
When you do this your the prompt changes from d:\my_project>
to (venv) d:\my_project>
, so you know you're inside a virtual environment and every package you install will be isolated to that environment.