py06_05-1：案例之小明爱跑步

class Person:

    def __init__(self,name,weight):
        self.name = name
        self.weight = weight

    def __str__(self):
        return '我叫%s，我的体重是%.2f' % (self.name, self.weight)  # %f，保留小数，2f指保留两位小数

    def run(self):
        self.weight -= 0.5

    def eat(self):
        self.weight += 1

xiaoming = Person('小明',75)

xiaoming.run()
xiaoming.eat()

print(xiaoming)