A simple mixin example

mixin-example.py

"""
A simple mixin example.

This script illustrates using a mixin to impart a "foo" method to other
class definitions.

"""

class FooMixin(object):

    def foo(self):
        return "foo: %s" % repr(self)

class MySet(set, FooMixin):
    pass

class MyInt(int, FooMixin):
    pass

s = MySet([1, 2])
i = MyInt(100)

# Prints: "foo: MySet([1, 2])"
print(s.foo())

# Prints: "foo: 100"
print(i.foo())