#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:ZhengzhengLiu
school = "Qing hua"    #全局变量
def change_name(name):
  school = "Bei da"  #局部变量
  print(school)
  print("before change:",name)
  name = "LIU"  #局部变量，只在函数内部生效（局部变量的作用域就是定义该变量的子程序）
  print("after change:",name)
print(school)
name = "liu"    #全局变量，在整个程序中都有效
change_name(name)
print(name)

school = "Qing hua"    #全局变量
def change_name(name):
  print("before change:",name)
  name = "LIU"  #局部变量，只在函数内部生效（局部变量的作用域就是定义该变量的子程序）
  print("after change:",name)
  global school    # 函数内将局部变量改为全局变量用global声明
  school = "Bei da"
name = "liu"    #全局变量，在整个程序中都有效
change_name(name)
print(name)
print("school:",school)

names = ["liu","zhang","wang"]
def chang_name():
  names[0] = "sun"
  print(names)
chang_name()
print(names)