When you call a generator function it doesn't actually run the function; instead it returns a generator object.
Have a function that returns a list? You may be able to turn it into a generator function by replacing the append calls with yield statements.
Iterators are lazy iterables which power all iteration in Python. Iterators are the generic form of a generator-like object.
Python's built-in next function will consume the next item from a given iterator.
From Python's perspective, an iterable is any object that you can pass to the built-in iter function to get an iterator from it.
You can make your own iterator classes, but you usually shouldn't. Generators are the easy way to make an iterator.
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