I've put the output that you would get from the help() command in IDLE on the Programmer's Guide's main page:

Chimera Programmer's Guide

It covers the Molecule, Residue, Atom, and Bond classes.  Let me know if you want more classes included.

--Eric

                        Eric Pettersen

                        UCSF Computer Graphics Lab

                        http://www.cgl.ucsf.edu