school = "fosu"#全局变量
def change_name(name):
    global sex #声明它是全局变量
    sex = "femal"
    print("before change",name,school)
    name = "QJH"#局部变量，只作用于局部，这个函数就是这个变量的作用域
    age = 23
    print("before change",name)

name = "qjh"
change_name(name)
print(name)
#print(age)#因为age只是局部变量，所以这里出错
print(sex)

#不提倡，不应该在函数里改全局变量,例如这样不应该！！
def change_name():
    global name
    name = "qjh"
change_name()
print(name)

#除了字符串和整数不能在局部改全局，列表，字典，集合可以在局部改全局
names = ["qjh","mate","xiaomi"]
def change_name():
    names[0] = "七九"
    print("inside is:",names)

change_name()
print(names)#局部里面改了，这里打印输出也跟着改了

#除了字符串和整数不能在局部改全局，列表，字典，集合可以在局部改全局
names = ["qjh","mate","xiaomi"]
def change_name():
    names[0] = "七九"
print("inside is:",names)

change_name()
print(names)#局部里面改了，这里打印输出也跟着改了