class Cup:

    #构造函数，初始化属性值

    def __init__(self,capacity,color):

        self.capacity=capacity

        self.color=color

    def retain_water(self):

        print("杯子颜色："+self.color+"，杯子容量："+self.capacity+",正在装水.")

    def keep_warm(self):

        print("杯子颜色："+self.color+"，杯子容量："+self.capacity+",正在保温.")

cup1=Cup('450ml','红色')

cup2=Cup('700ml','黄色')

cup1.retain_water()

cup2.keep_warm()