Serhiy Storchaka added the comment:
Actually the tp_new field of list iterator class is NULL. Unpickler raises
other error in such case (see issue24900 for example).
UnpicklingError: NEWOBJ class argument has NULL tp_new
Backported to 2.7 the part of the patch for issue22995 fixes this issue.
>>> copy.copy(iter([]))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/serhiy/py/cpython-2.7/Lib/copy.py", line 88, in copy
rv = reductor(2)
TypeError: can't pickle listiterator objects
----------
dependencies: +Restrict default pickleability
nosy: +serhiy.storchaka
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14350>
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