Raymond Hettinger added the comment:
When a cycle object has fully consumed its input iterable, __reduce__ method
uses the returns a space-inefficient result when space-efficient alternative is
available.
# Current way of restoring a cycle object with excess info in setstate:
>>> c = cycle(iter('de'))
>>> c.__setstate__((['a', 'b', 'c', 'd', 'e'], 1))
>>> ''.join(next(c) for i in range(20)) # next 20 values
'deabcdeabcdeabcdeabc'
# The same result can be achieved with less information:
>>> c = cycle(iter('de'))
>>> c.__setstate__((['a', 'b', 'c'], 0))
>>> ''.join(next(c) for i in range(20)) # next 20 values
'deabcdeabcdeabcdeabc'
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24874>
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