python类与对象

Question

创建Person 类，该类对象具有 属性name、weight、height、sex，要求如下：(1)对name属性进行封装，但外界仍然可以访问name以及设置name(2)有一个方法属性bmi，可以获取一个人的bmi，bmi只读不可写，bmi计算规则为：bmi=weight/(height*height)(体重单位：千克；身高单位：米)

Answer 1

class Person:
    def __init__(self, name, weight, height, sex):
        self._name = name
        self.weight = weight
        self.height = height
        self.sex = sex

    def name(self):
        return self._name

    def name(self, new_name):
        self._name = new_name

    def bmi(self):
        if self.height <= 0:
            return None
        return self.weight / (self.height ** 2)

person = Person(name="张三", weight=60, height=1.65, sex="女")

print(person.name)
person.name = "李四"
print(person.name)
print(person.bmi)