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() Rat.py Rational numbers 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 -- especially the window modules are full of them.)
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.