Comment by deizel

Given you'll want to activate a virtual environment for most Python projects, and projects live in directories.. I find myself constantly reaching for direnv. https://github.com/direnv/direnv/wiki/Python

    echo "layout python\npip install --upgrade pip pip-tools setuptools wheel\npip-sync" > .envrc

When you CD into a given project, it'll activate the venv, upgrade to non-ancient versions of Pip/etc with support for latest PEPs (ie. `pyproject.toml` support on new Python 3.9 env), verify the latest pinned packages are present.. it's just too useful not to have.

    direnv stdlib

This command (or this link https://direnv.net/man/direnv-stdlib.1.html) will print many useful functions that can be used in the `.envrc` shell script that is loaded when entering directories, ranging from many languages, to `dotenv` support, to `on_git_branch` for e.g. syncing deps when switching feature branches.

Check it out if you haven't.. I've been using it for more years than I can count and being able to CD from a PHP project to a Ruby project to a Python project with ease really helps with context switching.