[Python-Dev] python2.7 infinite recursion when loading pickled object
__peter__ at web.de
Mon Aug 11 13:40:13 CEST 2014
Terry Reedy wrote:
> On 8/11/2014 5:10 AM, Schmitt Uwe (ID SIS) wrote:
> Python usage questions should be directed to python-list, for instance.
>> I discovered a problem using cPickle.loads from CPython 2.7.6.
> The problem is your code having infinite recursion. You only discovered
> it with pickle.
>> 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)
> This is a (common) bug in your program. __getattr__ should call
> self.__dict__(name) to avoid the recursion.
Read again. The OP tries to delegate attribute lookup to an (existing)
IMO the root cause of the problem is that pickle looks up __dunder__ methods
in the instance rather than the class.
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