python 局部变量与全局变量作用域

school = 'bei feng'#全局变量

def change(name):
    global school #声明更改全局变量
    school = 'Linux mage'
    print('before change',name,school)
    name = 'liuhao'#局部变量,只在函数里面生效。这个函数就是局部变量作用域
    print('before change',name)

name = 'liucheng'
change(name)
print(name,school)