Coffee machine coding with OOP

OOP is object oriented programming which helps shorten code so that it is more legible. OOP organizes coding in classes, attributes and methods.

By using OOP, I could simplify the coffee machine project.

Usually when using premade classes to simplify code, there is a manual that instructs you on how to use each method and attribute.

The coffee machine project also came with a bunch of classes and their attributes and methods.

I did find these a bit hard to understand at first though.

Class definitions

MenuItem Class Attributes:

• -  name

  (str) The name of the drink. e.g. “latte”

• -  cost

  (float) The price of the drink. e.g 1.5

• -  ingredients

  (dictionary) The ingredients and amounts required to make the drink. e.g. {“water”: 100, “coffee”: 16}

  
  

  Menu Class Methods:

• -get_items()Returns all the names of the available menu items as a concatenated string. e.g. “latte/espresso/cappuccino”

• - find_drink(order_name)

  Parameter order_name: (str) The name of the drinks order.Searches the menu for a particular drink by name. Returns a MenuItem object if it exists, otherwise returns None.

In the Menu class method it said that it would return a menuitem object. I didn't understand that it meant that the order_name put into the method would be evaluated and judged if it was in the list of orderable menus.

I first made a variable to ues of the menuitem class which was a mistake.

It turned out the class has only attributes, so it can be only be called by the method in the menu class.

CoffeeMaker Class Methods:

• -  report()

  Prints a report of all resources. e.g.Water: 300mlMilk: 200ml

  Coffee: 100g

• -  is_resource_sufficient(drink)

  Parameter drink: (MenuItem) The MenuItem object to make.Prints a message if ingredients are insufficient.Returns True when the drink order can be made, False if ingredients are insufficient. e.g.True

Here, the input 'drink' was also going back to refer to the menuitem. Before, I needed to specify what I was talking about depending on the variable but all I needed to do here was input the drink by also referring to it as menu.find_drink(input('order drink:'))

(of course

menu = Menu()

must be specified beforehand)

Before I fully understood all classes in the directions, I tried to complete the latter code with longer code:

from menu import Menu, MenuItem

from coffee_maker import CoffeeMaker

from money_machine import MoneyMachine

menu= Menu()

coffee_maker = CoffeeMaker()

money_machine = MoneyMachine()

is_on = True

money = 0

while is_on:

    choice = input('What would you like?: espresso, latte, cappuccino?').lower()

    if choice == 'off':

        is_on = False

    elif choice == 'report':

        coffee_maker.report()

        money_machine.report()

    elif choice in ['espresso', 'latte', 'cappuccino']:

        drink = menu.find_drink(choice)

        sufficiency = coffee_maker.is_resource_sufficient(drink)

        if sufficiency:

            cost = 0

            if money_machine.make_payment(drink.cost):

                print('Here is your drink')

            else:

                print('Insufficient funds')

        else:

            print('Insufficient resources')

When all I needed to do was this:

from menu import Menu, MenuItem

from coffee_maker import CoffeeMaker

from money_machine import MoneyMachine

menu= Menu()

coffee_maker = CoffeeMaker()

money_machine = MoneyMachine()

is_on = True

money = 0

while is_on:

    choice = input('What would you like?: espresso, latte, cappuccino?').lower()

    if choice == 'off':

        is_on = False

    elif choice == 'report':

        coffee_maker.report()

        money_machine.report()

    elif choice in ['espresso', 'latte', 'cappuccino']:

        drink = menu.find_drink(choice)

        sufficiency = coffee_maker.is_resource_sufficient(drink)

        if sufficiency:

            if money_machine.make_payment(drink.cost):

                coffee_maker.make_coffee(drink)

What I learned

• Fundamentals of OOP

  • Classes

  • Attributes(how to use attributes as inputs in methods)

  • Methods

  OOP:

  class is the blueprint for actual intended object

  ex) car blueprint and actual car

  
  

  car = CarBlueprint() (object and class respectively)

  
  

  attributes = data that an object has

  ex) car.speed(object, attribute)

  
  

  methods= can do things

  ex)car.stop() (object, method)