Python Iterators and Generators

In Python, iterators and generators are both mechanisms for iterating over a sequence of values, but they have different implementations and use cases.

Iterator

An iterator is an object that implements the iterator protocol, which consists of the __iter__() and __next__() methods. It allows you to iterate over a collection of items one at a time, fetching the next item when requested.

Here's an example of an iterator that generates a sequence of numbers up to a given limit: