Python super class reflection

Question

If I have Python code

class A():
    pass
class B():
    pass
class C(A, B):
    pass

and I have class C, is there a way to iterat

Answer 1

@John: Your snippet doesn't work -- you are returning the class of the base classes (which are also known as metaclasses). You really just want cls.__bases__:

class A: pass
class B: pass
class C(A, B): pass

c = C() # Instance

assert C.__bases__ == (A, B) # Works
assert c.__class__.__bases__ == (A, B) # Works

def magicGetSuperClasses(clz):
  return tuple([base.__class__ for base in clz.__bases__])

assert magicGetSuperClasses(C) == (A, B) # Fails

Also, if you're using Python 2.4+ you can use generator expressions instead of creating a list (via []), then turning it into a tuple (via tuple). For example:

def get_base_metaclasses(cls):
    """Returns the metaclass of all the base classes of cls."""
    return tuple(base.__class__ for base in clz.__bases__)

That's a somewhat confusing example, but genexps are generally easy and cool. :)