Python Basics (iv)

One. Adorner (a very important content)

Definition: The essence is a function, (decorating other functions) is to add other functions for other functions

Note: A. Cannot modify the source code of the decorated function,

B. You cannot modify the calling method of the decorated function.

Add:

A. The function is "variable" and assigns the function body to the function name.

B. Higher-order functions + nested functions >>>> decorators

C. Higher order functions: pass a function name as an argument to another function (without modifying the source code of the decorated function);

The return value contains the function name (without modifying the way the decorated function is called).

#一个函数名当做实参传给另一个函数
Import TimedefBar (): Time.sleep (3)    Print('In the bar')defTest1 (func): Start_time=time.time () func ()#Run BarStop_time =time.time ()Print("The func run time is%s"% (Stop_time-start_time))#run time equals end time minus start timeTest1 (BAR)

Note: I don't understand this (hahaha)

# The return value contains the function name
Import  timedef  Bar ():    time.sleep (3)    print(' In the bar ' )def  Test2 (func):    print(func)    return  func#print (Test2 (bar))bar = test2 (bar) bar ()

d. Nested functions

A function is nested, and a function is declared inside the function, not a call to the

def foo ():     Print ("in thefoo")     def Bar ():         Print ("intne bar")    #函数的嵌套, declare a function inside the function, instead of calling     Bar () foo ()

#局部变量与全局变量的访问次序:
x = 0def  Grandpa ():    = 1    def  dad ():        x=2        def son ():            x=3            Print (x)        son ()    dad () Grandpa ()
Run Result: 3

1 Import Time2USER,PASSWD ="Xiaolaizi","abc123"3 #Decorative Device4 defAuth (func):5     defWrapper (*args,**Kwargs):6Username = input ("Username:"). Strip ()#strip go to space7Password = input ("Password:"). Strip ()8 9         ifuser = = Username andpasswd = =Password:Ten             Print("\033[32;1muser has passed authentication\033[0m") Oneres = func (*args,**Kwargs) A             Print(20*'*') -             returnRes -         Else: theExit"\033[31;1muser have not passed authentication\033[0m") -     returnwrapper - defIndex ():#Define a home page -     Print("Welcome to Index page") +@auth#Local authentication @auth (auth_type = "local") - defHome ():#Define a landing page +     Print("Welcome to Home Page") A     return "From home" at@auth#Remote Authentication @auth (Auth_type = "LDAP") - defBBS ():#Define a forum area page -     Print("Welcome to BBS page") -  - index () - Print(Home ()) in #Home () -BBS ()

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Python Basics (iv)