Function Pipelines with persistent State (FPS) - FPS programming

waterbottle.py

class WaterBottle(object):
    def __init__(self):
        self.water = 100
        self.max_capacity = 500
        self.make = "Plastic"

    def add_water(self, amount):
        if self.max_capacity < self.water + amount:
            self.water = self.max_capacity
            print "OverFlow"
        else:
            self.water += amount
            print self.water

    def drink_water(self, amount):
        if amount > self.water:
            self.water = 0
            print "Finish"
        else:
            self.water -= amount
            print self.water