1.反射
四个方法:getattr() 获取
class Person(): def __init__(self,name,age): self.name = name self.age = age p = Person('wdc',22) a = getattr(p,'name') #获取对象p的字符串为“name”的方法 print(a)
hasattr() 判断
class Person(): def __init__(self,name,age): self.name = name self.age = age p = Person('wdc',22) if hasattr(p,'name'): #反射:判断对象p中是否有字符串为“name”的方法。 print('有') else: print('没有')
setattr() 赋值
class Person(): def __init__(self,name,age): self.name = name self.age = age p = Person('wdc',22) setattr(p,'sex','Female') #给对象p创建一个为“sex”的属性,并赋值为“Female” print(p.sex)
class Person(): def __init__(self,name,age): self.name = name self.age = age def talk(self): print('{} is speaking ...'.format(self.name)) p = Person('wdc',22) # 给类绑定一个新的方法 setattr(Person,'speak',talk) #为类Person添加名字为“speak”的方法,并把函数talk赋值给speak方法 p.speak()
delattr() 删除
class Person(): def __init__(self,name,age): self.name = name self.age = age p = Person('wdc',22) print(p.age) delattr(p,'age') #删除对象p的名字叫做“age ”的方法 print(p.age)