Installing Python 2 and 3 on various systems

README.md

Blog 2020/5/1

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Installing Python 2 and 3 on various systems

Reminder to self about how to install and invoke Python 2 vs. 3 on the various platforms I use.

See also https://xkcd.com/1987

Summary: What do I get when I type ____?

Platform	python / pip	python2 / pip2	python3 / pip3
MacOS (Mojave) / Homebrew	2.x	2.x	3.x
Debian (Buster)	2.x	2.x	3.x
Windows (7) / MSYS2	3.x	2.x	3.x

MacOS (Mojave) / Homebrew:

Note: this assumes /usr/local/bin precedes /usr/bin in your $PATH.

Python 3.x:

brew install python

Invoke as python3 and pip3.

Python 2.x:

This is a bit of a pain.

brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/86a44a0a552c673a05f11018459c9f5faae3becc/Formula/python@2.rb

Invoke as python and pip (or python2 and pip2).

Debian (Buster):

Python 3.x:

apt-get install python3 python3-pip

Invoke as python3 and pip3.

Python 2.x:

apt-get install python python-pip

Invoke as python and pip (or python2 and pip2).

Windows (7) / MSYS2:

Python 3.x:

pacman -S python python-pip

Invoke as python and pip (or python3 and pip3).

Python 2.x:

pacman -S python2 python2-pip

Invoke as python2 and pip2.