September 2016
Intermediate to advanced
775 pages
18h 22m
English
Content preview from Python: Master the Art of Design PatternsBecome 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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Use cases
Many developers use the undo example as the only use case of the Command pattern. The truth is that undo is the killer feature of the Command pattern. However, the Command pattern can actually do much more [GOF95, page 265], [j.mp/commddp]:
- GUI buttons and menu items: The PyQt example that was already mentioned uses the Command pattern to implement actions on buttons and menu items.
- Other operations: Apart from undo, Command can be used to implement any operation. A few examples are cut, copy, paste, redo, and capitalize text.
- Transactional behavior and logging: Transactional behavior and logging are important to keep a persistent log of changes. They are used by operating systems to recover from system crashes, relational databases to ...
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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.
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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.