learn python the hard way（笨办法学python） 练习40 类的用法

class Song(object):  #创建一个类Song，它是对象的一种 Make a class named Song that is-a object

    def __init__(self, lyrics):  #类Song有一个__init__接受self和lyrics作为参数 class Song has-a __init__ that takes self and lyrics parameters
        self.lyrics = lyrics  #从self中获取lyrics属性，并将其设为lyrics     From self get the lyrics attribute and set it to lyrics

    def sing_me_a_song(self):   #类Song有一个函数名称为s..,它接受self作为参数 class Song has-a function named s..that takes self parameters
        for line in self.lyrics:    #for循环
            print line

happy_bday = Song(["Happy birthday to you",    #将happy_bday设为类Song的一个实例
                   "I don't want to get sued",
                   "So I'll stop right there"])

bulls_on_parade = Song(["They rally around tha family",  #设为类Song的一个实例
                        "With pockets full of shells"])

happy_bday.sing_me_a_song()  #从happy_bday中找到sing_me_a_song函数，并调用它。

bulls_on_parade.sing_me_a_song()  #从bull_on_parade中找到sing_me_a_song函数，并调用它。