Python namespaces with side effects

Crazy namespace, Python 2

>>> class Madness(dict):
...     def __setitem__(self, attr, value):
...         if isinstance(value, type):
...             value.__name__ = attr
...         dict.__setitem__(self, attr, value)
... 
>>> code = """\
... class Example(object): pass
... NewName = Example
... print(Example.__name__)
... """
>>> exec code in Madness()
NewName

Crazy namespace, Python 3

>>> class Madness(dict):
...     def __setitem__(self, attr, value):
...         if isinstance(value, type):
...             value.__name__ = attr
...         dict.__setitem__(self, attr, value)
... 
>>> code = """\
... class Example: pass
... NewName = Example
... print(Example.__name__)
... """
>>> exec(code, Madness())
NewName