Mixins in object-oriented programming enable the reuse of functionality across disparate data types while maintaining loose coupling. They help achieve cleaner designs and modular, composable code. Common in many languages, Python uses multiple inheritance to implement mixins. These classes provide additional capabilities or modify behavior without rigid hierarchies. They also serve as dependency injection, facilitating customization in external code contexts, such as third-party libraries. For example, using mixins can prevent code duplication by consolidating shared methods like serialization into a single class.
In object-oriented programming (OOP), a mixin is a tool that allows you to reuse a common piece of functionality across several, often unrelated data types while keeping them loosely coupled.
Python mixins are ordinary classes with a special meaning. You use them to give other classes new superpowers or to modify their current behavior without forming a rigid type hierarchy.
Mixins can also act as a form of dependency injection, allowing you to customize code beyond your control, for example, by plugging into a third-party library or framework.
Implementing the same serialization logic in each class would lead to duplicate code, which violates the DRY principle.
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