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Iterators :

An iterator in python is an object that can be iterated upon. This means the iterator returns the data one at a time. __iter__( ) method is used for initializing the iterator object, and __next__( ) is used to iterate over the object.

__iter__( ) and __next__( ) together called as iterator protocol. In python for loop internally creates an iterable object and calls the __next__( ) to get the elements one by one.

If we can iterate over any object then it is called Iterable. In python strings, lists, tuples, sets, and dictionaries are iterable.

NOTE: Everything is an object in python. Lists, Tuples, Sets, and Dictionaries all are objects of their respective classes. When we create any of them, an object of the particular class is created, and all the attributes and methods of the class can be used on this object.

Iterating Through an Iterator :

For an iterable, let’s create an iterable object and use the next( ) function to iterate through it.

NOTE : next(obj) is same as obj.__next__( )

Working of for loop :

In python for loop is used to iterate over the iterable like strings, Lists, Tuples, etc. For loop internally uses the iterators to iterate over the iterable. Internally for loop creates an iterator object and calls the next() method to get the next element. Whe