This is an old copy of the Python FAQ. The information here may be outdated.

What is an iterator?

An iterator is an object that represents a stream of data. Unlike a sequence, an iterator can (usually) only provide the next item. The for-in statement uses iterators to control the loop, and iterators can also be used in many other contexts.

To add iteration support to your own classes, implement the __iter__ method.

CATEGORY: programming


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