Python is a flexible programming language with a large selection of pre-built features and modules. Python’s support for iterators is one of its important features. An iterator is a tool for repeatedly going over a set of items or data.


An object in Python that implements the iterator protocol’s two methods, iter() and next, is known as an iterator (). The next() method returns the following item in the collection, whereas the iter() method returns the iterator object itself. The next() method throws the StopIteration exception when the collection is empty.

It is practical to iterate over data collections like lists, tuples, and dictionaries using iterators. They offer a quick and effective method for handling huge datasets without using a lot of memory.


The built-in iterators offered by Python include range, enumerate, zip, and map. The enumerate iterator creates a sequence of tuples holding the index and value of each item in a collection, while the range iterator creates a sequence of numbers. When two or more collections are combined into a single iterator, the zip iterator creates tuples that contain one item from each collection. The map iterator creates an iterator with the results after applying a function to each item in a collection.


Python offers a mechanism to define unique iterators in addition to the built-in iterators. A custom iterator is a Python object that implements the iter() and next() methods to specify the iterator protocol. Iterators for unique data structures can be built using custom iterators, as can processing logic.


Python’s iterators feature is a potent tool that allows programmers to create clear and effective code for handling big data sets. They offer a straightforward and reliable method for iterating over various data structure types and can be tailored to meet particular needs. Iterators allow programmers to create Python code that is more effective, easier to read, and easier to maintain.

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