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+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.)