What are iterators in Python?

1.	What are iterators in Python?
Answer» An iterator is an object. It remembers its state i.e., where it is during iteration (SEE code below to see how) __iter__() method initializes an iterator. It has a __next__() method which returns the next item in iteration and points to the next element. Upon reaching the end of iterable object __next__() must return StopIteration exception. It is also self-iterable. Iterators are OBJECTS with which we can iterate over iterable objects LIKE lists, strings, etc. class ArrayList: def __init__(self, number_list): self.numbers = number_list def __iter__(self): self.pos = 0 return self def __next__(self): if(self.pos < len(self.numbers)): self.pos += 1 return self.numbers[self.pos - 1] ELSE: raise StopIterationarray_obj = ArrayList([1, 2, 3])it = iter(array_obj)print(next(it)) #output: 2print(next(it)) #output: 3print(next(it))#Throws Exception#Traceback (most RECENT call last):#...#StopIteration

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