cpython/Demo/classes

Examples of classes that implement special operators (see class.doc):

Complex.py	Complex numbers
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
Vec.py		A simple vector class

(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.)