Python Pizza Order Menu Program Example

A demonstration on how to make a console menu driven program for ordering pizza.

[ELiTEspionage]

Former student here, '15. Currently on my 6th year of my career as a DotNet dev. Still find myself referring people to these informative videos. Thanks Rob!

[marmont]

import os

size_prices = {'S': 8, 'M':10, 'L':12}
topping_prices = {'Pepperoni':3, 'Sausage':3, 'Mushrooms':3, 'Bacon':3, 'Onions':3, 'Extra Cheese':3, 'Peppers':3, 'Olives':3, 'Spinach':3, 'Basil':3, 'Tomato':3, 'Beef':3}

class Order():
def __init__(self):
self.order_items = []

def add_item(self, item):
for topping in item.toppings:
if not is_topping_allowed(topping):
raise Exception("invalid_topping " + topping)
self.order_items.append(item)

def remove_item(self, index):
if index >= 0 and index <= len(self.order_items):
del self.order_items[index]
return True
else:
return False

def compute_total(self):

total = 0.0
for item in self.order_items:
item_price = size_prices[item.size]
for topping in item.toppings:
item_price += topping_prices[topping]
total += item_price

return total

class OrderItem():
def __init__(self, product, toppings, size):
self.product = product
self.toppings = toppings
self.size = size

def parse_from_string(line):
line = line.strip()
product, toppings_csv, size = line.split(";")
toppings = toppings_csv.split(", ")
return OrderItem(product, toppings, size)

def is_topping_allowed(topping):
return topping in topping_prices

def display_header():
print("Welcome to Lunch your order service!")


def display_order(order):
if len(order.order_items) == 0:
print("No order items yet")
else:
index = 1
for item in order.order_items:
print(
f"Item {index}: Product '{item.product}' with toppings '{item.toppings}' in size '{item.size}'")
index += 1

def get_users_choice():
selection = input("(A)dd, (R)emove, (S)ave, (L)oad, (P)rint, (C)ompute total, (Q)uit: ")
if len(selection.strip()) == 0:
return "Q"
return selection[0].upper()


def add_order_item(order):
size = input("Please enter food size (S, M, L): ")[0].upper()
print(f"Toppings:\n{', '.join(topping_prices.keys())}")
toppings = []
while True:
topping = input("Please enter your toppings or press enter to stop: ")
if topping == "":
break

if not is_topping_allowed(topping):
print(f"Topping {topping} is not allowed!")
continue

toppings.append(topping)

order_item = OrderItem("Pizza", toppings, size)
order.add_item(order_item)


def remove_order_item(order):

index_to_remove = int(input("Please enter position of item to remove: ")) - 1
if not
print("Item does not exist in order.")

def save_order(order):
file_name = input("Please enter file name: ")
with open(file_name, 'w') as f:
for item in order.order_items:
# Pizza Salami M
# Pizza Salami, Onions M
f.write(f"{item.product};{', '.join(item.toppings)};{item.size}\n")


def load_order():
file_name = input("Please enter file name: ")

order = Order()
with open(file_name, 'r') as f:
for line in f.readlines():
# skip empty lines
if line == '':
continue


return order

def compute_order_price(order):
total = order.compute_total()
print(f"Total: {total}")

def display_goodbye():
print("Thank you for using Lunch order!")

def main():
display_header()

order = Order()

while True:
choice = get_users_choice()
os.system("clear")
if choice == "A":
add_order_item(order)

elif choice == "R":
remove_order_item(order)

elif choice == "S":
save_order(order)

elif choice == "L":
order = load_order()

elif choice == "C":
compute_order_price(order)

elif choice == "P":
display_order(order)

if choice == "Q":
break

display_goodbye()


if __name__ == "__main__":
main()