How can I create custom iterators in Python?

How can I create custom iterators in Python?

You can create custom iterators in Python by defining a class with __iter__() and __next__() methods.

Can you show me a simple example?

Sure! Here's a basic example:

class Countdown:
    def __init__(self, start):
        self.current = start

    def __iter__(self):
        return self

    def __next__(self):
        if self.current <= 0:
            raise StopIteration
        else:
            self.current -= 1
            return self.current + 1

for number in Countdown(5):
    print(number)

What does this code do?

This code creates a countdown iterator that counts down from a specified number to 1.

Can I use this iterator in a loop?

Yes, you can use it in a loop just like any other iterable in Python!