January 2015
Intermediate to advanced
212 pages
4h 22m
English
Content preview from Mastering Python 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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A software example
Python's sorted() and list.sort() functions are examples of the Strategy pattern. Both functions accept a named parameter key, which is basically the name of the function that implements a sorting Strategy [Eckel08, page 202].
The following example (the code is in the langs.py file) shows how two different strategies can be used to sort programming languages in the following ways:
- Alphabetically
- Based on their popularity (using the TIOBE index [j.mp/tiobe14])
A namedtuple programming language [j.mp/namedtuple] is used to keep the statistics of the programming languages. A named tuple is an easy-to-create, lightweight, immutable object type. It is compatible with a normal tuple but it can also be treated as an object (can be called ...
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