The PEP [0] has been revised since then, and the current recommendation regarding /usr/bin/python is "equivalent to python2 OR equivalent to python3 OR not available at all OR configurable by user/sysadmin".
I like using `<python_executable> -m pip` to avoid all ambiguity about what python version I'm running pip with/installing things for. Usually `python3 -m pip`, or `python3.8 -m pip`.
I like using pyenv to manage Python versions which will then always symlink "pip" and "python" to whichever version is my system default, directory tree default, shell default, virtualenv etc.
