The path to Python learning: the prelude to adorners

Adorner:

Definition: The essence is a function, function: (Decorate other functions) is to add additional functions for other functions;

Principle: 1, cannot modify the source code of the adornment function

2. Cannot modify the calling mode of the decorated function

Implement the Adorner Knowledge Reserve:

1, function is "variable"

2. High-order function

3. Nested functions

Higher order function + nested function = "Adorner"

Import timedef Timer (func):    def warper (*args,**kwargs):        start_time =time.time ()        func ()        stop_time= Time.time ()        print (' The Func run time is%s '% (stop_time-start_time))    return warper@timerdef test1 ():    Time.sleep (3)    print (' in the Test1 ') test1 ()

anonymous function: No Name required (memory recycle)

Calc = Lambda x:x*3print (Calc (3))

#函数即 "Variable" # def foo (): #     print (' In the Foo ') #     bar () # foo () #----------------------def bar ():    print (' in the bar def foo ():    print (' In the Foo ')    bar () foo () #-----------------------------------------------def foo ():    Print (' In the Foo ')    Bar () def bar ():    print (' in the Bar ') foo ()

The path to Python learning: the prelude to adorners