Python basic article "Nineth": Anatomy Decorator

Adorner:
Adorner: The adorner's syntax begins with @, followed by the adorner function's name and optional parameters, followed by an optional parameter that the adorner declares to be a decorated function and a decorative function.
Anatomy Decorator:

#!/usr/bin/env Python3 ' Adorner: The adorner's syntax begins with @, followed by the adorner function's name and optional parameters, followed by the adorner's declared optional parameters for the modified function and the adornment function. Expression: Def outer (): def Inne  R (): Print ("XXX") return Test return inner @outer def F1 (): Pass F1 () "# Def Outer (func): # def inner (*args, **kwargs): # Print ("123") # ret = func (*args, **kwargs) # #print ( RET) # print ("456") # return ret# return innerdef outer_0 (func): Def inner (*args, **kwargs): P Rint ("3.5") ret = func (*args, **kwargs) print (ret) return ret return inner@outer_0# @outerdef Inde X (A1,A2): Print ("This is the content of the INDEX function! ") return a1 + a2# ret = index (+) # print (ret) index # @outer_0 # def F1 (): # Print (" F1 ") # return" AAAAA "# F1    () "Above adorners performed by anatomy: 1. The program starts executing, sees the function" Def outer (func) ", does not execute, puts this function into memory, and then continues to execute.    2. See the function "Def outer_0 (func):" Is put into memory and will not be executed.      3. When you go down to see @outer_0 and execute this function, the interpreter will pass the function "index" below @outer_0 as an argument to the parameter "func" in the "outer_0" function, so now "index" = "Func"  def outer_0 (index): #拿到index函数, pass it as an argument into the function def inner (1, 2): #                        The second-level function (which will find the corresponding value from the primary function, which will pass in the index parameter), the body parameter corresponds to the entity parameter so *args = 1, # #kwargs = 2 print ("3.5") #自己函数体的值 print ("This is the content of the INDEX function! ") #从index函数中拿到的值 ret = func (1, 2) #在这赋值一个变量ret, however the value of this variable is func (1, 2), why?                Because Func is the return value of index 1, and 2 is the entity parameter Print (RET) from index #然后把这个返回值给输出出来 return ret #最后把返回值给上一层的函数 return inner 4. Then redefine the return value of Outer_0 to the "index" function, that is, "index" equals "O Uter_0 "return value! This step is equivalent to recreating a new" index "Function! and the content of this new" index "function is the return value of" Outer_0 "! ("Index" = return value of "Outer_0")

Code Execution Results:

C:\Users\Administrator\AppData\Local\Programs\Python\Python35\python.exe d:/pycharm/obj/old_boy/day07/ Adorner. py3.5 this is the content of the INDEX function! 3Process finished with exit code 0

* Note: Multiple adorners are handled when multiple decorators are executed.

@outer @outer_0def Index ():    print ("Test") Index () #等于一下方式执行:    (outer*index) *outer_0    (OUTER*OUTER_0) * Index is calculated as a multiplication method!

　　

　　

Python basic article "Nineth": Anatomy Decorator