__qualname__ implementation in Python 2

know_thyself.py

from inspect import isclass
import __builtin__

# We're going to overwrite object, so we need to squirrel away the old one:
obj = object


# Metaclass, overriding the class' __getattribute__,
# so that __qualname__ can be generated and cached on access:
class QualnameMeta(type):
    def __getattribute__(cls, name):
        if name == '__qualname__' and '__qualname__' not in dir(cls):
            result = cls.__name__
        else:
            result = obj.__getattribute__(cls, name)
            if isclass(result) and '__qualname__' not in dir(result):
                result.__qualname__ = '.'.join([cls.__qualname__, name])
        return result


# OMG I'm swapping out object for my own implementation:
class object(object):
    __metaclass__ = QualnameMeta

# Make it properly global:
__builtin__.object = object

test_know_thyself.py

import know_thyself


# Test implementation - only the top-level class needs to extend MagicQual:
class A(object):
    class B(object):
        class C(object):
            pass


# Ensure it works
print A.__qualname__        # => A
print A.B.__qualname__      # => A.B

# Just make sure reassignment still works:
C = A.B.C
print C.__qualname__        # => A.B.C