Virtual Environment

Make virtual environment

$ pip install virtualenv
$ virtualenv mypython

Start virtual environment

$ source mypython/bin/activate

Deactivate virtual environment

$ deactivate

Start virtual environment in Python3

$ virtualenv -p python3 <envname>

Environment variables inside virtual environment

$ vi .env
>> Type your environment variables in this file (VAR=VALUE)

$ pip install python-dotenv

Switch python version in virtualenv

Use case: Some dependencies are not supported by Python3.8 yet.

$ virtualenv --python=/usr/bin/python<version> <path/to/new/virtualenv/>

# To find path for python (it's not always /usr/bin/...):
$ which python<version_number>