ex40 模块，对象和类

　　很难理解，目前一知半解，希望通过后边的练习加深理解。
 1 #-*- coding: UTF-8 -*-
 2 '''
 3 import mystuff
 4 mystuff.apple()
 5 
 6 print mystuff.tangerline'
 7 '''
 8 class Song(object):
 9     
10     def __init__(self,words):#这里注意下划线是左右各两条，否则会出错；另外words在这叫形参。
11         self.lyrics = words
12     def sing_me_a_song(self):
13         for line in self.lyrics:
14             print line
15 
16 happy_bday = Song(["Happy birthday to you.","I don't want to get sued.","So I'll stop right there."])#括号里边的这一堆，叫实参
17             
18 happy_bday.sing_me_a_song()
19 
20 #保存问题
21 #Q1：如果运行如下代码，会报错并提示：
22 class Song(object):
23     
24     def __init__(self,lyrics,words):
25         self.lyrics = words
26     def sing_me_a_song(self):
27         for line in self.lyrics:
28             print line
29 
30 happy_bday = Song(["Happy birthday to you.","I don't want to get sued.","So I'll stop right there."])
31             
32 happy_bday.sing_me_a_song()
33 
34 #__init__() takes exactly 3 arguments(2 given)，不懂，等以后再来解答。