面向对象5-反射

 1 class people(object):
 2     def __init__(self, name, age):
 3         self.name = name
 4         self.age = age
 5 
 6     def talk(self):
 7         print(‘%s is talking ...‘%self.name)
 8 p1 = people(‘zsq‘, 28)
 9 choice = input(‘please inpute choice‘)
10 
11 #hasattr当前对象中有对应该字符串名的方法或属性返回True否则返回False.# choice输入name/age/talk都会返回True否则返回False
12 if choice in (‘name‘, ‘age‘, ‘talk‘):
13     print(hasattr(p1, choice))
14 else:
15     print(‘this choice not in hasattr‘)
16 
17 #getattr方法返回该对象对应字符串参数方法的内存地址,加()就可以执行。# 如果字符串是对象的属性则直接返回属性值。
18 if choice in ( ‘talk‘, ):
19     getattr(p1, choice)()
20 elif choice in (‘name‘, ‘age‘):
21     a = getattr(p1, choice)
22     print(a)
23 
24 #setattr(x, ‘y‘, v) setattr命令以后调用对象的choice方法时，直接调用test_setattr函数；不论对象是否原来有该方法
25 #setattr命令以后调用对象的choice属性时时，直接返回v的内存地址（对象）或者值（常量）
26 def test_setattr():
27     print(‘this is test setattr‘)
28 
29 if choice == ‘talk1‘:
30     setattr(p1, choice, test_setattr)
31     p1.talk()
32 elif choice == ‘name1‘:
33     setattr(p1, choice, ‘name_test‘)
34     print(getattr(p1, choice))
35 #delattr 删除对象对应的属性或者方法
36 if choice == ‘age‘:
37     delattr(p1, choice)
38     print(p1.age)