Python Tools (2020 Edition)

Assumptions

You are using a POSIX-conforming operating system (some version of UNIX, GNU/Linux, macOS, or Windows Subsystem for Linux on Windows 10).
You are using the Bash shell. If you are not using the Bash shell, you know how to translate Bash shell commands to those of your shell of choice.
You understand the basics of Python virtual environments.

The Tools

pyenv: a tool for managing installed Python versions
pipx: a tool for managing Python-based command line applications
virtualenvwrapper: a tool for managing Python virtual environments
pip-tools: a tool for managing requirements.txt files

Suggested Reading

Jacob Kaplan-Moss. My Python Development Environment, 2020 Edition
Brett Cannon. Why you should use python -m pip
Nick Timkovich. RIP Pipenv: Tried Too Hard. Do what you need with pip-tools.