Iterators are objects that can be used in “for” loops from "summary" of Fluent Python by Luciano Ramalho
Iterators are objects that implement the iterator protocol, which consists of the `__iter__` method that returns the iterator object itself and the `__next__` method that returns the next element from a sequence. When there are no more elements to return, it raises the `StopIteration` exception. Any Python sequence is iterable because it implements the `__iter__` method. When you use a `for` loop in Python, the interpreter calls `iter()` on the container object. The `iter()` function checks if the object implements `__iter__`, and if not, tries to access the `__getitem__` method. If that also fails, Python raises a `TypeError`, indicating that the object is not iterable. This mechanism allows any Python object to be used in a `for` loop as long as it implements the iterator protocol. The `for` loop implicitly calls the `next()` function to retrieve each item from the iterator. When the `StopI...
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