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In this manner, what is use of iterator in python?

Iterator in python is any python type that can be used with a 'for in loop'. Python lists, tuples, dicts and sets are all examples of inbuilt iterators. These types are iterators because they implement following methods. In fact, any object that wants to be an iterator must implement following methods.

Similarly, how do you write an iterator in python? There are four ways to build an iterative function:

1. create a generator (uses the yield keyword)
2. use a generator expression (genexp)
3. create an iterator (defines __iter__ and __next__ (or next in Python 2. x))
4. create a class that Python can iterate over on its own (defines __getitem__ )

Besides, what is iterator and iterable in python?

Python | Difference between iterable and iterator. Iterable is an object, which one can iterate over. Iterator is an object, which is used to iterate over an iterable object using __next__() method. Iterators have __next__() method, which returns the next item of the object.

What is __ next __ in Python?

The __iter__() function returns an iterator for the given object (array, set, tuple etc. or custom objects). It creates an object that can be accessed one element at a time using __next__() function, which generally comes in handy when dealing with loops. Syntax : iter(object) iter(callable, sentinel)