How to implement hooks with decorators in python

Editor to share with you how to use python decorator to achieve hooks, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Description

1. Define a virtual namespace that can register a function, and the hook is required to be called during the function definition.

2. When the interpreter encounters a function definition, it will call the decorator function, which is an ideal hook to register the function in the virtual namespace.

In Python, decorators are used to encapsulate functions and allow us to add new functionality without modifying the function structure. The decorator takes the decorating function fn as an argument and returns the new function to make the actual call. The new function receives the args and kwargs of the original function and returns the final value.

Example

Import time def my_decorator (fn): "" this is a custom function that can decorate any function and print its execution time "def wrapper_function (* args, * * kwargs): start_time = time.time () # call the decorated function And get the return value value = fn (* args, * * kwargs) print ("the function execution took:", time.time ()-start_time, "seconds") # return the call result of the decorated function return value return wrapper_function @ my_decoratordef area (l, b): return l * b > > area (3 4) the function execution took: the above 9.5367431640625e-07 seconds12 is all the content of the article "how python uses decorators to implement hooks" Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!