Armin Rigo added the comment:
Ok, then with pickle you can have the same problem but only with
None-vs-no-total. Here is an artificial example:
import itertools, pickle
def foo(a, b):
print(a, b)
a = itertools.accumulate([3, 4, 5], foo)
next(a)
next(a) # prints: 3, 4
b = pickle.loads(pickle.dumps(a))
next(a) # prints: None, 5
next(b) # foo() is not called at all
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25718>
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