Metaclasses

gistfile1.py

class M(type):
    def __call__(self, *args, **kwargs):
         obj = type.__call__(self, *args)
         setattr(obj, "foo", self.baz)
         setattr(obj, "long_other_name", self.baz)
         setattr(obj, "metatastic", True)
         return obj
    
    def baz(cls):
        return "FooBaz -- Base class %s" % cls
    
class B:
    __metaclass__ = M
    
    def bar(self):
        return "Bar"
    
b = B()
print b.bar()
print b.foo()
print b.long_other_name()
print b.metatastic

output

Bar
FooBaz -- Base class <class '__main__.B'>
FooBaz -- Base class <class '__main__.B'>
True