fades is a system that automatically handles the virtualenvs in the cases normally found when writing scripts and simple programs, and even helps to administer big projects.
fades will automagically create a new virtualenv (or reuse a previous created one), installing the necessary dependencies, and execute your script inside that virtualenv, with the only requirement of executing the script with fades and also marking the required dependencies.
(If you don’t have a clue why this is necessary or useful, I'd recommend you to read this small text about Python and the Management of Dependencies: https://github.com/PyAr/fades/blob/master/docs/pydepmanag.rst)
Check the full documentation here: https://fades.readthedocs.io/
For developers, the project is here: https://github.com/PyAr/fades