Join Jungwoo Ryoo for an in-depth discussion in this video Abstract factory example, part of Python: Design Patterns.
- We'll start with the object…that will be returned by our concrete factory,…in this case, the dog object.…We need to define the dog class to be used…to instantiate the dog object.…So the usual method where we return woof as a string.…Next is the dog factory,…and this is our concrete factory.…And the concrete factory returns two objects.…
In this case, the first object we're returning is the dog…object, and the second object we're returning…is the dog food object, which is simply, a string object.…So let's complete this code by typing…return, the name of the class, dog,…and then we'll be returning the dog food string object,…so return, dog food.…The next class is the pet store class,…which will be housing our abstract factory,…actually, an instance of our abstract factory.…
So we'll have to have this attribute of the pet store…which is called _pet_factory,…which will be also storing an instance…of this concrete factory class.…The concrete factory class we're talking about in this case,…is dog factory, so let's initialize our attribute…
- Understanding design patterns
- Best design practices: consistency, completeness, and correctness
- Working with creational patterns
- Working with structural patterns
- Working with behavioral patterns
Skill Level Intermediate
Q: In the strategy pattern example, why does the code keep executing the default function rather than the alternate?
A: The programming demonstration skips the step of defining what the strategy pattern should be when an alternate function name is provided
as an argument as shown below.
1. Understanding Design Patterns
2. Creational Patterns
3. Structural Patterns
4. Behavioral Patterns
5. Design Best Practices
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