Examples of classes that implement special operators (see reference manual):

Complex.py Complex numbers Dates.py Date manipulation package by Tim Peters Dbm.py Wrapper around built-in dbm, supporting arbitrary values Range.py Example of a generator: re-implement built-in range() Rev.py Yield the reverse of a sequence Vec.py A simple vector class bitvec.py A bit-vector class by Jan-Hein B\"uhrman

(For straightforward examples of basic class features, such as use of methods and inheritance, see the library code.)