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This article mainly introduces the relevant knowledge of "how to realize the responsibility chain mode in Python". The editor shows you the operation process through the actual case, the operation method is simple and fast, and the practicality is strong. I hope this article "how to realize the responsibility chain model in Python" can help you solve the problem.

Sample code

The first is to model the request.

Three unrelated Request classes are built in the code, where Request1 and Request2 have functionality, while DummyRequest has no functionality. Next is the Handler base class:

The first are the Request1Handler and Request2Handler classes, which are used to deal with Request1 and Request2, respectively. The other DummyHandler is just used to declare that he doesn't do anything. Then there is the main function:

DummyRequest passes all Handler without being processed; the propagation of Request1 is interrupted after it is processed by Request1Handler; the propagation ends after Request2 is processed by Request2Handler.

Matters needing attention

Since Python does not check the types of variables, we do not need to define a base class for Request.

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