In article <1137144220.391281.321490 at g43g2000cwa.googlegroups.com>, "gene tani" <gene.tani at gmail.com> wrote: > http://zephyrfalcon.org/labs/python_pitfalls.html Thanks for posting that URL; I hadn't seen the list before. Skimming over it, none of them really seemed noteworthy until I got to "5. Mutable default arguments", which rather shocked me. Good stuff to know!