Python

Python的第十五天

一、return返回值

 作用：1、返回执行结果（若没有return，则返回值是none）

     2、程序执行，一遇到return，就代表着函数的结束

 练习：

def stu_register(name,age,course,country):
    print("-----------学生注册信息----------")
    print("name:",name)
    print("age:",age)
    print("course:",course)
    print("country:",country)
    if age > 22:
         return False
    else:
         return True 或 return True,name,age,course,country

a = stu_register("alex",20,"python","china")
print(a)
if a:
    print("注册成功。。")
else:
    print("sorry,,,")

-----------学生注册信息----------
name: alex
age: 20
course: python
country: china
True  或 (True,'alex','20','python','china')
注册成功。。

 

二、局部变量 and 全局变量

1、变量的查找顺序是 局部变量>全局变量

2、在函数里不能直接修改全局变量

name = "alex"
def change_name():
    name = "jack"
    print(name)
change_name()
print(name)

jack
alex

name = "alex"
def change_name():
    # name = "jack"
    print(name)
change_name()
print(name)

alex
alex

三、给函数传list、dict

dict = {"name":"alex","age":"22","hobbie":"大保健"}
list = ["liang","wang","li"]
def data(info,people):
    info["hobbie"] = "学习"
    people.append("zhang")
data(dict,list)
print(dict,list)

{'name': 'alex', 'age': '22', 'hobbie': '学习'} ['liang', 'wang', 'li', 'zhang']