Alexandre Vassalotti added the comment:
I fixed this while working on PEP 3154
[http://hg.python.org/features/pep-3154-alexandre/rev/eed9142d664f]. The
relevant piece is
@@ -420,7 +424,13 @@ class _Pickler:
write(REDUCE)
if obj is not None:
- self.memoize(obj)
+ # If the object is already in the memo, this means it is
+ # recursive. In this case, throw away everything we put on the
+ # stack, and fetch the object back from the memo.
+ if id(obj) in self.memo:
+ write(POP + self.get(self.memo[id(obj)][0]))
+ else:
+ self.memoize(obj)
# More new special cases (that work with older protocols as
# well): when __reduce__ returns a tuple with 4 or 5 items,
It would be pretty easy to backport this to 2.7 and 3.3. It is also good to
mention that that only protocol 0 and 1 are affected.
----------
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<http://bugs.python.org/issue892902>
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