"Schmitt Uwe (ID SIS)" <uwe.schm...@id.ethz.ch> writes:
> I discovered a problem using cPickle.loads from CPython 2.7.6.
>
> The last line in the following code raises an infinite recursion
>
> class T(object):
>
> def __init__(self):
> self.item = list()
>
> def __getattr__(self, name):
> return getattr(self.item, name)
>
> import cPickle
>
> t = T()
>
> l = cPickle.dumps(t)
> cPickle.loads(l)
...
> Is this a bug or did I miss something ?
The issue is that your __getattr__ raises RuntimeError (due to infinite
recursion) for non-existing attributes instead of AttributeError. To fix
it, you could use object.__getattribute__:
class C:
def __init__(self):
self.item = []
def __getattr__(self, name):
return getattr(object.__getattribute__(self, 'item'), name)
There were issues in the past due to {get,has}attr silencing
non-AttributeError exceptions; therefore it is good that pickle breaks
when it gets RuntimeError instead of AttributeError.
--
Akira
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