Скачать или смотреть Creating custom Iterator in Python OOPs

In Python, an iterator is an object that allows you to iterate over collections of data, such as lists, tuples, dictionaries, and sets.

Python iterators implement the iterator design pattern, which allows you to traverse a container and access its elements. The iterator pattern decouples the iteration algorithms from container data structures.

Iterators take responsibility for two main actions:

Returning the data from a stream or container one item at a time
Keeping track of the current and visited items
In summary, an iterator will yield each item or value from a collection or a stream of data while doing all the internal bookkeeping required to maintain the state of the iteration process.

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