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```
class Foo1(dict):
 def __getattr__(self, key): return self[key]
 def __setattr__(self, key, value): self[key] = value
class Foo2(dict):
 __getattr__ = dict.__getitem__
 __setattr__ = dict.__setitem__
o1 = Foo1()
o1.x = 42
print(o1, o1.x)
o2 = Foo2()
o2.x = 42
print(o2, o2.x)
```
With CPython 2.5, 2.6 (similarly in 3.2), I get:
({'x': 42}, 42)
({}, 42)
With PyPy 1.5.0, I get the expected output::
({'x': 42}, 42)
({'x': 42}, 42)
I asked this also on SO: http://stackoverflow.com/questions/6305267/python-inconsistence-in-the-way-you-define-the-function-setattr
From the answers, I am not exactly sure wether this is considered as a bug in CPython or not. Anyway, I just wanted to post this here.