April 2022
Intermediate to advanced
1014 pages
23h 59m
English
Content preview from Fluent Python, 2nd Edition
Become 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,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
Chapter 12. Special Methods for Sequences
Don’t check whether it is-a duck: check whether it quacks-like-a duck, walks-like-a duck, etc., etc., depending on exactly what subset of duck-like behavior you need to play your language-games with. (
comp.lang.python, Jul. 26, 2000)Alex Martelli
In this chapter, we will create a class to represent a multidimensional Vector
class—a significant step up from the two-dimensional Vector2d of Chapter 11.
Vector will behave like a standard Python immutable flat sequence.
Its elements will be floats, and it will support the following by the end of this chapter:
-
Basic sequence protocol:
__len__and__getitem__ -
Safe representation of instances with many items
-
Proper slicing support, producing new
Vectorinstances -
Aggregate hashing, taking into account every contained element value
-
Custom formatting language extension
We’ll also implement dynamic attribute access with __getattr__
as a way of replacing the read-only properties we used in Vector2d—although this is not typical of sequence types.
The code-intensive presentation will be interrupted by a conceptual discussion about the idea of protocols as an informal interface. We’ll talk about how protocols and duck typing are related, and its practical implications when you create your own types.
What’s New in This Chapter
There are no major changes in this chapter. There is a new, brief discussion of
the typing.Protocol in a tip box near the end of “Protocols and Duck Typing”.
In ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.