Do not use functions as metaclasses. It makes inheritance super-painful.

gistfile1.py

# class Foo(object): 
#    ... 
# is syntactic sugar for
# Foo = type('Foo', (object,), {...})
# And with a metaclass Meta:
# Bar = Meta('Bar', (object,), {...})

def metafunc(name, bases, dict):
    print "I created a new class %s%s from %s" % (name, bases, dict)
    return type(name, bases, dict)

class A(object):
    __metaclass__=metafunc


# I created a new class A(<type 'object'>,) from {'__module__': '__main__', '__metaclass__': <function metafunc at 0x258a70>}


class B(A, object):
    __metaclass__=metafunc
    
    an_attribute = "I am an attribute!"

# I created a new class B(<class '__main__.A'>, <type 'object'>) from {'an_attribute': 'I am an attribute!', '__module__': '__main__', '__metaclass__': <function metafunc at 0x258a70>}