day-3 函数 

 1 def write_file(filename,content):#filename，content都是形式参数
 2     with open(filename,'a+',encoding='utf-8') as fw:
 3         fw.write(content+'\n')
 4 
 5 
 6 def read_file(filename):
 7     with open(filename,encoding='utf-8') as fr:
 8         result = fr.read()
 9         return result#返回值，什么时候需要返回值，要看具体函数的作用
10     #函数里面遇到return,函数立即结束
11 
12 write_file('a.txt','aaaaaa')
13 rea = read_file('a.txt')#a.txt是实际参数
14 print(rea)
15 
16 def more():
17     name = 'xiaoming'
18     age = 18
19     score = 99
20     return name,age,score
21 #多个返回值
22 # 方法1
23 result = more()
24 print(result)
25 # 方法2
26 name,age,score = more()# 用3个值来接收
27 print(name)
28 print(age)
29 print(score)
30 
31 # 默认值参数
32 def user(name,sex='女'):
33     print(name,sex)
34 user('xiaobai','男')
35 user('xiaolan')

 

posted @ 2019-10-27 16:35  维特布朗尼  阅读(122)  评论(0)    收藏  举报