How can I create custom iterables in Python?

How can I create custom iterables in Python?

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

Can you show me an example of a custom iterable?

Sure! Here's a simple example of a custom iterable that counts from 1 to 5:

class CountToFive:
    def __iter__(self):
        self.current = 1
        return self
    
    def __next__(self):
        if self.current <= 5:
            number = self.current
            self.current += 1
            return number
        else:
            raise StopIteration

How do I use this custom iterable in a loop?

You can use it in a for loop like this:

for number in CountToFive():
    print(number)
``` This will print numbers 1 to 5.

What if I want to create an iterable that generates Fibonacci numbers?

You can modify the class to generate Fibonacci numbers by keeping track of the last two numbers. Would you like to see that example?