Python iter() built-in function
From the Python 3 documentation
Return an iterator object. The first argument is interpreted very differently depending on the presence of the second argument. Without a second argument, object must be a collection object which supports the iterable protocol, or it must support the sequence protocol. If it does not support either of those protocols, TypeError is raised.
>>> i = iter([1, 2, 3]) >>> i # <list_iterator object at 0x7f93158badc0> >>> i.__next__() # 1 >>> i.__next__() # 2 >>> i.__next__() # 3
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