Some things about decorator

#!/usr/bin/env python#--*--coding:utf-8--*--__author__ = ' Kevin ' def deco (func):    def In_deco (xx,yy):        print (' In Deco ')        func (xx,yy)    print (' Call deco ')    return in_deco# when the Python interpreter sees @deco, it calls the Deco function # incoming parameter bar, which is Deco ( BAR) and returns a function object In_deco#bar = In_deco#bar () In_deco () bar () #实质也是对闭包的使用 @decodef Bar (x, y):    print (' In bar ', x+y) print (Type (bar)) bar (ON)

#!/usr/bin/env python#--*--coding:utf-8--*--__author__ = ' Kevin ' def Dec (func):    print ' Call dec! '    Def in_dec (*arg):        print (' in Dec arg= ', arg)        if Len (arg) = = 0:            return 0 for Val in         a Rg:if not isinstance (val,int): Return 0 return func (*arg) print (' Return in_dec ') return in_dec# When the Python interpreter sees @dec, it will pass #my_sum as a parameter into the DEC # decorated function my_sum point to the new function in_dec# the essence of the adorner is the use of our closures @decdef my_sum (*arg): #my _sum = In_dec print (' in My_sum ') return sum (ARG) #my_sum = Dec (my_sum) Print (My_sum (1,2,3,4,5)) def My_ Average (*arg): return sum (ARG)/len (ARG)           

Some things about decorator