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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 Decorator Pattern is a pattern described in the Design Patterns Book. It is a way of apparently modifying an object's behavior, by enclosing it inside a decorating object with a similar interface. This is not to be confused with Python Decorators, which is a language feature for dynamically modifying a function or class. [8]
In software engineering, a software design pattern or design pattern is a general, ... Flyweight: Use sharing to support large numbers of similar objects efficiently.
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.
Data abstraction is a design pattern in which data are visible only to semantically related functions, to prevent misuse. The success of data abstraction leads to frequent incorporation of data hiding as a design principle in object-oriented and pure functional programming.
In object-oriented programming, the iterator pattern is a design pattern in which an iterator is used to traverse a container and access the container's elements. The iterator pattern decouples algorithms from containers; in some cases, algorithms are necessarily container-specific and thus cannot be decoupled.
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
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 .