JSON for Humans, allows comments and is less error prone.
Hjson, the Human JSON. A configuration file format that caters to humans and helps reduce the errors they make.
It supports #, // and /**/ style comments as well as avoiding trailing/missing comma and other mistakes. For details and syntax see http://laktak.github.io/hjson.
Hjson works with Python 2.5+ and Python 3.3+ (forked from from simplejson)
API: See the simplejson docs: http://simplejson.readthedocs.org/