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Decorator 1. Definition 1. Decorator: essentially a function 2. Function: used to decorate other functions and add additional functions to other functions 2. Principle 1. The source code of the decorated function cannot be modified 2. The source code of the decorated function cannot be modified How to call decorated functions 3. Implement decorators 1. The concept of functions as variables 2. Higher-order functions 3. Nested functions>> High-order functions + nested functions = decorators 4. Functions are variables 1. Functions and Analogy of variables x = 1 print(id(x)) def test(): pass print(test) #output 1842348496 In the above example, we defined a variable "x" and a function test(), and we printed out the locations of the variable and function in memory respectively. It can be seen that print(test) is print("Function name&quo

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