https://docs.python.org/3.3/using/windows.html 

Just wanted to let you know, these links:

Installing on Windows
in “Dive into Python: Python from novice to pro” by Mark Pilgrim, 2004, ISBN 1-59059-356-1
For Windows users
in “Installing Python” in “A Byte of Python” by Swaroop C H, 2003

are dead.

Also: I'd like to have both python 2.7 and 3.7.x installed on windows, but of course only one can be associated with .py files at one time. It there a way to switch without re-installing?

Greetings,

--
Jan