How to implement delegation pattern in Python

Today, I will talk to you about how to achieve the entrustment model in Python. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

In Python, in the delegate class object, you need to design it as follows:

1. Override the _ _ getattr__ method so that the delegate gets the handler's properties.

two。 Determines whether the property is a callable function, returns directly if not, and if so, encapsulates it as a callable object with wrapper.

As follows:

The advantage of this is that the handler (delegate) does not need to make too many changes, which is generally a common class. Our processors are as follows:

This allows the request to be processed by the delegate to call a method of another class:

If _ _ name__ ='_ _ main__': John = Dog (voice ()) John.words ('woof')

In fact, if you don't override _ _ getattr__, you can call the voice class in the following ways:

If _ _ name__ = ='_ main__': John = Dog (voice ()) John.voice.words ('woof') after reading the above, do you have any further understanding of how to implement the delegation mode in Python? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.