If you write Python code then watching this video of Raymond Hettinger describe how to improve your Python code is worth 49 minutes of your time. Even though the original description of the talk, describes its audience level as “Novice” – there's something there for even advanced Python developers because since Python has grown so much as a language there are many features or idioms developers may not be taking advantage of. Raymond's talk is fast-paced, practical, and immediatley useful. Watch this talk and share it widely.
The slides are available here: https://speakerdeck.com/pyconslides/transforming-code-into-beautiful-idiomatic-python-by-raymond-hettinger
Additional PyCon videos can be found here: http://pyvideo.org/