debian Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? code example

Example 1: ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?

export PYTHONPATH=/Library/Python/3.7/site-packages

Example 2: couldn't import django. are you sure it's installed and available on your pythonpath environment variable? did you forget to activate a virtual environment?

source newenv/bin/activate