List of python developers and users on https://twitter.com
Guido van Rossum https://twitter.com/gvanrossum
Michael Foord https://twitter.com/voidspace
James Tauber https://twitter.com/jtauber
Ted Leung https://twitter.com/twleung
Doug Hellmann https://twitter.com/doughellmann
David Stanek https://twitter.com/dstanek
Augusto Becciu https://twitter.com/abecciu
Skip Montanaro https://twitter.com/skipmontanaro (though I don't really know why)
Fred Drake https://twitter.com/freddrake
Georg Brandl https://twitter.com/birkenfeld
Armin Ronacher https://twitter.com/mitsuhiko
Juergen Brendel https://twitter.com/BrendelConsult
List of usergroups and python related events:
Portland Python UG https://twitter.com/pdxpython
Tucson Python UG https://twitter.com/TuPLE
I started the list as a response to https://rubylearning.com/blog/2008/10/29/50-rubyists-to-follow-on-twitter/. Feel free to add python developers or yourself if you tweet about python -- https://twitter.com/peterhoffmann