成人的BMI数值：
过轻：低于18.5
正常：18.5-23.9
过重：24-27
肥胖：28-32
非常肥胖, 高于32
体质指数（BMI）=体重（kg）÷身高^2（m）
EX：70kg÷（1.75×1.75）=22.86
# property装饰器就是将一个函数属性伪装成一个数据属性
# class People:
# def __init__(self,name,weight,height):
# self.name=name
# self.weight=weight
# self.height=height
#
# @property
# def bmi(self):
# return self.weight / (self.height ** 2)
#
#
# obj=People('egon',80,1.83)
# # print(obj.bmi())
#
# print(obj.bmi)
# 了解
# class People:
# def __init__(self,name):
# self.__name=name
#
# @property
# def name(self):
# return self.__name
#
# @name.setter
# def name(self,obj):
# if type(obj) is not str:
# print('名字必须是str类型')
# return
# self.__name=obj
#
# @name.deleter
# def name(self):
# # print('不让删')
# del self.__name
#
# obj=People('egon')
# # print(obj.name)
#
# # obj.name='EGON'
# # obj.name=123
# # print(obj.name)
#
# del obj.name
# print(obj.name)
class People:
def __init__(self,name):
self.__name=name
def get_name(self):
return self.__name
def set_name(self,obj):
if type(obj) is not str:
print('名字必须是str类型')
return
self.__name=obj
def del_name(self):
# print('不让删')
del self.__name
name=property(get_name,set_name,del_name)
obj=People('egon')
print(obj.name)
# obj.name='EGON'
# obj.name=123
# print(obj.name)
# del obj.name
# print(obj.name)