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    Upvotes976Top Answeredited Jul 4, 2018 at 13:12

    A mixin is a special kind of multiple inheritance. There are two main situations where mixins are used:

    1. You want to provide a lot of optional features for a class.

    2. You want to use one particular feature in a lot of different classes.

    For an example of number one, consider werkzeug's request and response system. I can make a plain old request object ...

    from werkzeug import BaseRequest

    class Request(BaseRequest):
    pass

    If I want to add accept header support, I would make that

    from werkzeug import BaseRequest, AcceptMixin
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  3. WEBSep 13, 2013 · Until C++20 CRTP was the standard workaround to realize mixins in C++. A mixin serves the avoidance of code duplication. It is a …

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      What is a mixin in object oriented programming?In object-oriented programming languages, a mixin is a class that contains methods for use by other classes without having to be the parent class of those other classes. How those other classes gain access to the mixin's methods depends on the language. Mixins are sometimes described as being "included" rather than "inherited".
      What is the difference between mixins and interfaces?Mixins is all about how a class does what it does, it's inheriting and sharing concrete implementation. Interfaces is all about what a class is, it is the abstract signature and promises that the class must satisfy. It's a type. Take a class that is implemented as class MyList<T> extends Something with ListMixin<T> ....
      How to implement mixinclass1 & mixin class2?Here is another way to implement MixInClass1, MixinClass2: Decorators are useful when you need to wrap many functions. Since MixinClass1 needs to wrap only one function, I think it is clearer to monkey-patch: Using double underscores for __old_method1 and __method1 plays a useful role in MixInClass1.
      How do other classes gain access to a mixin's methods?How those other classes gain access to the mixin's methods depends on the language. Mixins are sometimes described as being "included" rather than "inherited". In short, the key difference from an inheritance is that mix-ins does NOT need to have a "is-a" relationship like in inheritance.
      Are mixins a solution to a problem?Mixins are a solution to a problem. What problem do you have that mixins are meant to solve? Mixins have the following problems: name clashes, no built-in introspection (e.g. instanceof ), no standard way of doing them in JavaScript, difficulty of finding where a method is implemented.
      What is the purpose of a mixin in Python?Main purpose of Mixins is to provide functionalities which are standalone and it would be best if the mixins itself do not have inheritance with other mixins and also avoid state. In languages such as Ruby, there is some direct language support but for Python, there isn't.
    • WEBMay 31, 2018 · Unique to this approach is how it supports/solves "composite-mixins"... mixins that are created from other mixins. Linking behavior by super delegation and assigning another object-based mixin …

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