python如何对实例属性进行类型检查

#!/usr/bin/python3  class Attr(object): """ 对Person类中属性进行类型检查 """ # 传入字段名字 + 指定字段类型 def __init__(self, name, style):  self.name = name  self.style = style   # 取值 def __get__(self, instance, owner):  return instance.__dict__[self.name]   # 设值 def __set__(self, instance, value):  # 判断参数类型是否满足条件  if isinstance(value, self.style):   instance.__dict__[self.name] = value  else:   raise TypeError('need type: %s' % self.style)   # 删除值 def __delete__(self, instance):  del instance.__dict__[self.name]  class Person(object): name = Attr('name', str) age = Attr('age', int) height = Attr('height', float)   if __name__ == '__main__': p = Person()   p.name = 'xi_xi' # p.name = 55 p.age = 18 p.height = 1.75 print(p.name, p.age, p.height)   del p.height