Several periodicals dedicated to the Python Programming language (some active, some not, some are archives).
In no particular order:
The Python Papers - Established in 2006, with free downloads of printable issues. Please consider contributing an article to this volunteer-run publication!
Python Weekly - Started in mid 2013 (estimated), delivered via email.
Pycoders' Weekly - Launched Feb 2012; issued weekly via email, with an archive.
Python Magazine - First issue came out in October 2007. Available as PDF. Subscription required, but with some issues downloadable at no cost.
The Python: Rag - First issue came out in July 2009. Available as PDF. Free to download.