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Python: Master the Art of Design Patterns by Sakis Kasampalis, Chetan Giridhar, Dusty Phillips

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Chapter 1. The Factory Pattern

Creational design patterns deal with an object creation [j.mp/wikicrea]. The aim of a creational design pattern is to provide better alternatives for situations where a direct object creation (which in Python happens by the __init__() function [j.mp/divefunc], [Lott14, page 26]) is not convenient.

In the Factory design pattern, a client asks for an object without knowing where the object is coming from (that is, which class is used to generate it). The idea behind a factory is to simplify an object creation. It is easier to track which objects are created if this is done through a central function, in contrast to letting a client create objects using a direct class instantiation [Eckel08, page 187]. A factory reduces ...

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