Python 3 Patterns & Idioms / code / Metaclasses /

# Metaclasses/
# A function for __metaclass__ in Python 2.x

class Simple4(object):
    def __metaclass__(name, bases, nmspc):
        cls = type(name, bases, nmspc)
        cls.uses_metaclass = lambda self : "Yes!"
        return cls

simple = Simple4()
print simple.uses_metaclass()

""" Output:
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