#!/usr/bin/python
# -*- coding: UTF-8 -*-

# 可写函数说明
def sum(arg1, arg2):
    # 返回2个参数的和."
    total = arg1 + arg2
    print "函数内 : ", total
    return total;


# 调用sum函数
total = sum(10, 20);

def nop():
    pass

a = nop();