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。

#-*- coding: UTF-8 -*-
'''
import mystuff
mystuff.apple()

print mystuff.tangerline'
'''
class Song(object):
    
    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。
        self.lyrics = words
    def sing_me_a_song(self):
        for line in self.lyrics:
            print line

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
            
happy_bday.sing_me_a_song()

#保存问题
#Q1：如果运行如下代码，会报错并提示：
class Song(object):
    
    def __init__(self,lyrics,words):
        self.lyrics = words
    def sing_me_a_song(self):
        for line in self.lyrics:
            print line

happy_bday = Song(["Happy birthday to you.","I don't want to get sued.","So I'll stop right there."])
            
happy_bday.sing_me_a_song()

#__init__() takes exactly 3 arguments(2 given)，不懂，等以后再来解答。