Martin Panter added the comment:
The trouble with Serhiy’s suggestion is that it would still try to iterate the
argument:
>>> i = iter(lambda: print("ITERATION"), "infinity")
>>> i in dict() # No iteration
False
>>> i in ItemsView(dict())
ITERATION
ITERATION
ITERATION
False
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24434>
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