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Mastering Python Design Patterns. In software engineering, a design pattern is a recommended solution to a software design problem. Design patterns generally describe how to structure our code to solve common design problems using best practices. It is important to note that a design pattern is a high-level solution; it doesn't focus on implementation details such as algorithms and data structures [GOF95, page 13], [j.mp/srcmdp]. It is up to us, as software engineers, to decide which algorithm and data structure is optimal to use for the problem we are trying to solve.