This

https://www.python.org/doc/current/tut/tut.html

is 404 as of Thu Mar 23 13:12:13 EDT 2017

but there is a link to it in:

http://www.pygtk.org/pygtk2tutorial/ch-Introduction.html

These following links exist.

This one:

https://docs.python.org/tutorial/

currently redirects to this one:

https://docs.python.org/3/tutorial/

https://docs.python.org/2/tutorial/