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Mastering Python Design Patterns

Mastering Python Design Patterns

By : Sakis Kasampalis
3.6 (5)
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Mastering Python Design Patterns

Mastering Python Design Patterns

3.6 (5)
By: Sakis Kasampalis

Overview of this book

This book is for Python programmers with an intermediate background and an interest in design patterns implemented in idiomatic Python. Programmers of other languages who are interested in Python can also benefit from this book, but it would be better if they first read some introductory materials that explain how things are done in Python.
Table of Contents (18 chapters)
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1
1. The Factory Pattern
17
Index

Use cases

Flyweight is all about improving performance and memory usage. All embedded systems (phones, tablets, game consoles, microcontrollers, and so forth) and performance-critical applications (games, 3D graphics processing, real-time systems, and so forth) can benefit from it.

The Gang Of Four (GoF) book lists the following requirements that need to be satisfied to effectively use the Flyweight Pattern [GOF95, page 221]:

  • The application needs to use a large number of objects.
  • There are so many objects that it's too expensive to store/render them. Once the mutable state is removed (because if it is required, it should be passed explicitly to Flyweight by the client code), many groups of distinct objects can be replaced by relatively few shared objects.
  • Object identity is not important for the application. We cannot rely on object identity because object sharing causes identity comparisons to fail (objects that appear different to the client code, end up having the same identity).
...
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Tech Concepts
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Mastering Python Design Patterns
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