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.)
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