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The flyweight pattern is useful when dealing with a large number of objects that share simple repeated elements which would use a large amount of memory if they were individually embedded. It is common to hold shared data in external data structures and pass it to the objects temporarily when they are used.
The Python example seems to be based on an incorrect understanding of the pattern. It's simply inserting and retrieving from a shared dictionary, but a shared dictionary by itself is not a flyweight pattern. Besides it seems to be largely original research and contains a large off-topic discussion of immutability in Python's data model.
Extensibility pattern: a.k.a. Framework - hide complex code behind a simple interface; Facade pattern: create a simplified interface of an existing interface to ease usage for common tasks; Flyweight pattern: a large quantity of objects share a common properties object to save space; Marker pattern: an empty interface to associate metadata with ...
This creational pattern [1] is frequently used for numbers and strings in different programming languages. In many object-oriented languages such as Python, even primitive types such as integer numbers are objects. To avoid the overhead of constructing a large number of integer objects, these objects get reused through interning.
Design Patterns: Elements of Reusable Object-Oriented Software (1994) is a software engineering book describing software design patterns. The book was written by Erich Gamma , Richard Helm , Ralph Johnson , and John Vlissides , with a foreword by Grady Booch .
Flyweight pattern – an object programming design pattern, that also uses a kind of memoization; Hashlife – a memoizing technique to speed up the computation of cellular automata; Lazy evaluation – shares some concepts with memoization; Materialized view – analogous caching in database queries
Kim Kardashian turned heads in a sultry backless look for her latest red carpet moment.. The reality star, 44, stepped out to the Fourth Annual Fifteen Percent Pledge Gala in Los Angeles on ...
The Decorator Pattern (or an implementation of this design pattern in Python - as the above example) should not be confused with Python Decorators, a language feature of Python. They are different things. Second to the Python Wiki: The Decorator Pattern is a pattern described in the Design Patterns Book.