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This article mainly introduces "Python how to achieve BUILDER pattern". In daily operation, I believe many people have doubts about how to achieve BUILDER mode in Python. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "how Python realizes BUILDER mode". Next, please follow the editor to study!

Code example

Use smart pointers to eliminate memory leaks while changing the original code as little as possible.

The first is the interface:

The implementation code is also written in the same file in the "Design pattern" book, which is separated here:

Comparing this version of CreateMaze to the original, notice how the generator hides the internal representation of the maze-that is, the classes that define rooms, doors, and walls-and how these parts are assembled into the final maze. One might guess that there are some classes that represent rooms and doors, but there is no indication that which classes are used to represent walls. This makes it easier to change the representation of a maze because all MazeBuilder customers don't need to be changed.

The original version refers to the code used in abstract projects:

You can find the shadow of the original code in the StandMazeBuilder code.

This is actually refactoring. After refactoring, you can do some interesting things by implementing other concrete Builder classes, such as the CountingMazeBuilder in the example can count operations, and so on.

One more thing.

It is important to note that MazeBuilder does not need to know the type of object by using room numbers to identify important objects during construction. This is also a kind of abstraction. This technique is necessary in most cases in the process of using the Builder model.

At this point, the study on "how Python implements the BUILDER pattern" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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