10-3 function Adorner

The process of forming an adorner

The simplest adorner----has a return value----has a parameter----the function of the universal parametric adorner:

Do not want to modify the function call method, but also want to add function before and after the function # Principle: Open Closed principle
   Open: Open to expansion
   Closed: Closed for modification
Syntax sugar: @ Adorner function name, @timmer equivalent to Func = Timmer (func), where Func () is a decorated function, Timmer () is an adorner function

The simplest decorator

Import Timedef Timmer (f):    start = Time.time ()    f ()    end = Time.time ()    print (End-start) def func ():    Time.sleep (0.1)    print (' nice! ') Timmer (func)

Adorners decorated with return values

Import Time#timmer () is an adorner function, just a function with a decorative function Def timmer (f): #通过此闭包函数返回一个内部函数名, and then externally received, so that the received function name and external function name consistency can be    def inner ():        start = Time.time ()        ret = f ()      #被装饰的函数        end = Time.time ()        print (End-start)        return ret    return inner@timmer     #语法糖 [email protected] Adorner function name, equivalent to Func = Timmer (func) def func ():     #    decorated function    Time.sleep (0.1)    print (' nice! ')    Return ' Summertrain ' # func = Timmer (func) result = Func () print (result)

has one parameter

Import Time#timmer () is the adorner function Def timmer (f): #通过此闭包函数返回一个内部函数名, and then externally received, so that the received function name and the external function name consistency can be    def inner (a):        Start = Time.time ()        ret = f (a)      #被装饰的函数        end = Time.time ()        print (End-start)        return ret    return Inner@timmer     #语法糖 [email protected] Adorner function name, equivalent to Func = Timmer (func) def func (a):     #    decorated function    time.sleep ( 0.1)    print (' nice! ', a)    return ' Summertrain ' # func = Timmer (func) result = Func (1) print (result)

Universal parameters

#装饰带多个参数, and includes an adorner with the parameters of location and parameter import Time#timmer () is the adorner function Def timmer (f): #通过此闭包函数返回一个内部函数名, and then externally received, so that the received function name is consistent with the external function name    def Inner (*args,**kwargs):        start = Time.time ()        ret = f (*args,**kwargs)      #被装饰的函数        end = Time.time ()        print (End-start)        return ret    return inner@timmer     #语法糖 [email protected] Adorner function name, equivalent to Func = Timmer (func) def func (A, B):     #    decorated function    Time.sleep (0.1)    print (' nice! ', A, b)    return ' Summertrain ' # func = Timmer (func) result = Func (1,b=22) print (result)

The fixed mode of the adorner

#例子import Timedef Wrapper (f):     #   F is the decorated function    def inner (*args,**kwargs):        "The thing to do before being decorated function '"        ret = f (*args,**kwargs)        " The thing after being decorated function "        return ret    return inner@wrapperdef func (b):    Time.sleep (0.1)    print (' nice! ', A, b)    return ' Summertrain ' #减缩版def Wapper (func):    def Inner (*args,**kwargs):        ret = func (*args,**kwargs)        return ret    return inner@wapper#qqxing = Wapper (qqxing) def qqxing ():    print (1111) result = qqxing ()

　　

10-3 function Adorner