July 2010
Beginner to intermediate
404 pages
10h 6m
English
Content preview from Python 3 Object Oriented ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Comprehensions
We've already seen a lot of Python's for loop. It allows us to loop over any object that supports the iterable protocol and do something specific with each of the elements in turn.
Supporting the iterable protocol simply means an object has an __iter__ method that returns another object that supports the iterator protocol. Supporting the iterator protocol is a fancy way of saying it has a __next__ method that either returns the next object in the sequence, or raises a StopIteration exception when all objects have been returned.
As you can see, the for statement, in spite of not looking terribly object-oriented, is actually a shortcut to some extremely object-oriented designs. Keep this in mind as we discuss comprehensions, as they, ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.