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Python: iterator

An iterator might be created by a generator, or functions like map, filter or iter and functions that use the yield statement..

Relation to iterables

An iterator is an object with an __iter__ and a __next__ method.
The presence of the __iter__ method makes the iterator also an an iterable. However, an iterable is not necessarily an iterator.

See also

Example: create an arbitrary number of fibonacci numbers
The built in function iter and The built in function next.
The itertools standard library.

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