1. #!/usr/bin/python
    2. # -*- coding: UTF-8 -*-
    4. # 可写函数说明
    5. def sum( arg1, arg2 ):
    6.    # 返回2个参数的和."
    7.    total = arg1 + arg2
    8.    print "函数内 : ", total
    9.    return total
    11. # 调用sum函数
    12. total = sum( 10, 20 )