Iterators in Python
An iterator is an object that allows traversal through a sequence of values – one at a time. It's the mechanism behind for loops and many built-in functions.
Python's iteration protocol uses two special methods: __iter__() and __next__(). Understanding iterators helps you create custom iterable objects.
How For Loops Work
for item in iterable: is equivalent to calling iter() and next() repeatedly.
Creating a Custom Iterator
Define __iter__() (returns self) and __next__() (returns next value or raises StopIteration).
Using iter() and next()
Quick Quiz
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