Talk is cheap

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# @Date    : 2018-07-07 21:54:33
# @Author  : Simon (simon.xie@codewalker.meg)
# @Link    : http://www.codewalker.me
# @Version : 1.0.0

import os
from random import randint

def create_list(length=10):
    return [ randint(0,10) for _ in range(length) ]

def wrapper(func):
    def wrapper(*arg, **kwargs):
        # --- 附加功能 ---
        print('calling{}..'.format(func.__name__))
        return func(*arg, **kwargs)
    return wrapper

@wrapper
def sum_normal(l):
    sum_for_list = 0
    for i in l:
        sum_for_list += i
    return sum_for_list
    
@wrapper
def sum_recursion(l):
    if l == []:
        return 0
    return l[0] + sum_recursion(l[1:])

def main():
    l = create_list(3)    
    print('list:{l}\nsum:{sum}'.format(l=l,sum=sum_normal(l)))
    print('-'*80)
    print('list:{l}\nsum:{sum}'.format(l=l,sum=sum_recursion(l)))
if __name__ == "__main__":
    main()