Learn how to use Python’s optional type-hinting syntax to create cleaner and more useful code.

This problem causes me to need to modify the script every time I create a virtual environment through the python -m venv venv command, or just use the ./venv/bin/python command to run python instead ...

Take control of multiple Python installations in Windows with the py launcher, available as part of a standard Python installation.

Related to #1062 Python 3.9 tests for windows fail as virtualenv==20.0.34 not compatible with python on windows and previous versions virtualenv are not compatible with Python 3.9.