1 class People:
 2     def __init__(self,name,age,gender):   #self其实就是指自己，也就是下面调用的那个a1
 3         self.name = name
 4         self.age = age
 5         self.gender = gender
 6     person='人类'
 7     def eat(self):
 8         print('%s对吃很有研究' %self.name)
 9     def sleepp(self):
10         print('%s对睡觉也很有研究' %self.name)
11 a1 = People('stt',18,'male')
12 # 类属性的增删改查
13 # 增
14 def play(self):
15     print('%s对玩也很有研究' %self)
16 People.play = play
17 People.gender = 'male'
18 print(People.__dict__)
19 People.play('stt')          #stt对玩也很有研究
20 
21 # 删
22 del People.gender
23 print(People.__dict__)
24 
25 # 改
26 People.gender = 'female'
27 def sleepp(self):
28     print('%s爱睡觉皮肤好好' %self.name)
29 People.sleepp = sleepp
30 a1.sleepp()             #stt对睡觉也很有研究
31 # 查
32 print(People.person)