Question

It's my python homework. Not Java.

Design type 1:

# Creating an object of the class "DeAnzaBurger"

theOrder = DeAnzaBurger()

# calling the main method

theOrder.main()

# And the class is like:

class DeAnzaBurger:

# You may need to have a constructor

def __init__(self):
self._orderDict = {}

self._priceBeforeTax = 0

self._priceAfterTax = 0

# you may have the tax rate also as an instance variable. But as I mentioned, you can use your

# own deign.

   ....

# That the class has a main method to run other needed methods. Like:

def main(self):
self.displayMenu()
self.getInput()

self.calculateTheBill()

...

self.printTheBill()

self.saveToFileTheBill()

  

def displayMenu(self):

# display the menu

...

def getInput(self):

# Get the order from the user and fill the "_orderDict" instance variable. - You may return some

# variable from this class. It's depend on your design.

....

  

def calculateTheBill(self):

# Calculate the price before and after tax. - You may pass in or return some variable from this class.

# It's depend on your design.

...

def printTheBill(self):

# Print the bill on the console - You may pass some variable in this class. It's depend

# on your design.

def saveToFileTheBill(self):

# Save the bill in a file - You may pass some variable in this class. It depends

# on your design.

# This method can be merged with the printTheBill together. It depends on your design.

Design type 2:

# Creating an object of the class "DeAnzaBurger"

theOrder = DeAnzaBurger()

# calling the needed method

theOrder.displayMenu()
theOrder.getInput()

theOrderDict = theOrder.getOrderDict()

theOrder.calculateTheBill(theOrderDict )

theOrderBalance = theOrder.getTheBalance()

...

theOrder.printTheBill(theOrderBalance)

theOrder.saveTheBillToFile(theOrderBalance )

# And the class may be the same as the design type 1 class with some changes.

class DeAnzaBurger:

...

...

For design type 2, you may need mutators and accessors:

def setOrderDict(theUpdatedOrderDict):

  _orderDict = theUpdatedOrderDict

def getOrderDict():

return _orderDict

***********************************************************************************************************

• Use a dictionary as a data structure to send data from a method to another method. Or make it as an instance variable. Then you can fill it and use it everywhere in your class.
  • you may need 2 dictionaries("_" means they are private):

_menuDict = {'De Anza Burger':5.25,'Bacon Cheese':5.75, ... ,'Don Cali Burger':5.95}

which the keys are the food name and the values are the prices.

_orderDict = {'Bacon Cheese':5, ... ,'Don Cali Burger':2}

which the keys are the order (food) name and the values are the quantities of the orders.

(As I mentioned, these all are samples and you can have your own designs and names.)

• Print the bill on the screen and also in a file.

Use the following naming style for your file - you may use it in the saveToFileTheBill method.

import time # <= This line can be on the top of your code
timeStamp = time.time()
# print(timeStamp) # <= You don't need this line. I just put it here to show you what the output will be.
#1533498418.1082168

import datetime
orderTimeStamp = datetime.datetime.fromtimestamp(timeStamp).strftime('%Y-%m-%d %H-%M-%S')
# print(orderTimeStamp)   # <= You don't need this line. I just put it here to show you what the output will be.
#2018-08-05 12-46-58

# Then concatenate this string with ".txt"

orderTimeStamp = orderTimeStamp + '.txt'

# 2018-08-05 12-46-58.txt

# Now you can use this string as your output file name:

fileHandleToSaveTheBill = open(orderTimeStamp,'w')

• Use strip() function to strip your inputs.

Answer 1

import collections
from string import capwords

def foodplan(price, stock):
if not str(stock).isdecimal():
raise ValueError("Can only assign a whole number to stock attribute")
return type('FoodPlan', (object,), dict(price=float(price), stock=int(stock)))

def get_choice():
while True:
option = input("What would you like? ")
if option.isdecimal() and 0 <= int(option) - 1 < len(choices):
return list(choices.keys())[int(option) - 1]
elif capwords(option) in choices.keys():
return capwords(option)
else:
print("Invalid item")

def get_quantity(choice):
while True:
quantity = input("How many would you like? ")
if quantity.isdecimal():
if int(quantity) <= choices[choice].stock:
return int(quantity)
else:
print("There is not enough stock!")
else:
print("Illegal quantity")

choices = collections.OrderedDict({
"Big Mac": foodplan(2.50, 50),
"Large Fries": foodplan(0.50, 200),
"Vegetarian Burger": foodplan(1.00, 20),
})

if name == '_main_':

orders = dict(zip(choices.keys(), [0] * len(choices)))

print("Welcome to McDonald's")
ordering = 'y'
while ordering == 'y':
[print("{0}. {1}, £{2}".format(
i + 1, list(choices.keys())[i], list(choices.values())[i].price
)) for i in range(len(choices))]
choice = get_choice()
quantity = get_quantity(choice)
orders[choice] += quantity
choices[choice].stock -= quantity
ordering = input("Do you want to order more items? [y/*] ").lower()
print("\nThank you for ordering!\nYour total cost is: £{0}".format(
sum([orders[choice] * choices[choice].price
for choice in choices.keys()])
))