February 2016
Beginner to intermediate
164 pages
3h 25m
English
book
Learning Python Design Patterns - Second Edition - Second Edition
by Chetan Giridhar, Gennadiy Zlobin
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Frequently asked questions
Q1. Should a low-level component be disallowed from calling a method in a higher-level component?
A: No, a low-level component would definitely call the higher-level component through inheritance. However, what the programmer needs to make sure is that there is no circular dependency where the low-level and high-level components are dependent on each other.
Q2. Isn't the strategy pattern similar to the Template pattern?
A: The strategy pattern and Template pattern both encapsulate algorithms. Template depends on inheritance while strategy uses composition. The Template Method pattern is a compile-time algorithm selection by sub-classing while the strategy pattern is a runtime selection.
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