What is the iterator in python?

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Tags:- Python

Python | Iterator | (__iter__ and __next__)

Iterators are objects that can be iterated upon. The iterator protocol for Python declares that we must make use of two functions to build an iterator- iter() and next().

 
  • iter()- To create an iterator
  • next()- To iterate to the next element
>>> a=iter([2,7,5,8])
>>> next(a)
# 2

>>> next(a)
# 7

>>> next(a)
# 5

>>> next(a)
# 8

>>> next(a)
# Traceback (most recent call last): 
# File “<pyshell#31>”, line 1, in <module>
# next(a)
# StopIteration