总算开始学类了，上次就是在这over的。

class Song(object):
 def __init__(self, lyrics):
  self.lyrics = lyrics
 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"])
bulls_on_parade = Song(["They rally around the family",
 "With pockets full of shells"])
happy_bday.sing_me_a_song()
bulls_on_parade.sing_me_a_song()