These following guidelines are targeted at Python files. HTML files, zpt files, shell scripts, etc should adhere to these as much as is reasonable and conventional in those languages. Currently, we follow Guido's "Style Guide for Python Code" which is detailed in PEP 8 (Python Enhancement Proposals)

http://www.python.org/dev/peps/pep-0008/

Any style conventions that stray from PEP-8 should be annotated in this document.