Iteration Overloading Methods in Python

The __iter__ returns the iterator object and is implicitly called at the start of loops. The __next__ method returns the next value and is implicitly called at each loop increment. __next__ raises a StopIteration exception when there are no more value to return, which is implicitly captured by looping constructs to stop iterating.

class Counter:
    def __init__(self, low, high):
        self.current = low
        self.high = high
 
    def __iter__(self):
        return self
 
    def __next__(self):
        if self.current > self.high:
            raise StopIteration
        else:
            self.current += 1
            return self.current - 1
 
 
for num in Counter(5, 15):
    print(num)

Sample output of above program.

5
6
..
..
15

Python Programming

Iteration Overloading Methods in Python

Sample output of above program.