This is great advice. To tack on:

Python has had built-in virtualenv support since 3.3[1], meaning that you can do this:

    python -m venv env/

...on any version of Python released in the last decade and get a reasonable virtual environment. To go one step further, you can also have `venv` automatically bring `pip` and `setuptools` to their latest versions:

    python -m venv --upgrade-deps env/

...which you should almost always do, since the versions bundled with your Python distribution are likely to be behind the latest.