McDonald's Food Ordering Serivce - Full Code

import re 

running = True 
global menu
global prices 
deliveryCost = 2

menu = ["Egg McMuffin", "Sausage McGriddle", "Hash Browns", "Big Mac", "McDouble", "Cheeseburger", "McChicken", "Filet-O-Fish", "Chicken McNuggets", "Iced Coffe", "Soft Drink", "Water", "Happy Meal", "French Fries", "Salad"]
prices = [2.79, 2.79, 1.09, 3.99, 1.39, 1.00, 1.29, 3.79, 4.49, 1.79, 1.29, 1.00, 3.00, 1.79, 4.59]
cost = [] 
customerOrder = [] 

def fillInfo(): 
  print("Welcome to the McDonald's Python ordering service!")
  print("Please fill out the following information. Press enter after each entry. Also, keep in mind that there is a $2 delivery fee.")
  print("")
  while running == True: 
    global customer_name
    customer_name = input("Name:") 
    if not re.match("^[a-zA-Z ]*$", customer_name): 
      print("Please use letters only")
    elif len(customer_name) == 0: 
      print("Please enter a valid input")
    else:
      customer_name = customer_name.title()
      break 
  while running == True: 
    global phone
    phone = input("Phone number:")
    if not re.match("^[0-9 ]*$", phone): 
      print("Please use numbers only")
    elif len(phone) == 0:
      print("Please enter a valid input")
    else:
      break
  while running == True: 
    global address
    address = input("Street address:")
    if len(address) == 0:
      print("Please enter a valid input")
    else:
      address = address
      break
  while running == True: 
    global city
    city = input("City:")
    if not re.match("^[a-zA-Z ]*$", city): 
      print("Please use letters only")
    elif len(city) == 0:
      print("Please enter a valid input")
    else:
      city = city.title()
      break
  while running == True: 
    global zipcode
    zipcode = input("Zipcode:")
    if not re.match("^[0-9 /]*$", zipcode): 
      print("Please use numbers only")
    elif len(zipcode) == 0 or len(zipcode) > 5:
      print("Please enter a valid zipcode (no more than 5 digits)")
    else:
      break

fillInfo() 

def print_menu():
  print ("""
  -----------------------------------------------
  |               MCDONALD'S MENU               |
  |                                             |
  |                  Breakfast                  |
  |        -----------------------------        |
  |         1. Egg McMuffin       $2.79         |
  |         2. Sausage McGriddle  $2.79         |
  |         3. Hash Browns        $1.09         |
  |                                             |
  |                    Burgers                  |
  |        -----------------------------        |
  |         4. Big Mac            $3.99         |
  |         5. McDouble           $1.39         |
  |         6. Cheeseburger       $1.00         |
  |                                             |
  |             Chicken & Sandwiches            |
  |        -----------------------------        |
  |         7. McChicken          $1.29         |
  |         8. Filet-O-Fish       $3.79         |
  |         9. Chicken McNuggets  $4.49         |
  |                                             |
  |                   Drinks                    |
  |        -----------------------------        |
  |         10. Iced Coffee       $1.79         |
  |         11. Soft Drink        $1.29         |
  |         12. Water             $1.00         |
  |                                             |
  |                    Other                    |
  |        -----------------------------        |
  |         13. Happy Meal        $3.00         |
  |         14. French Fries      $1.79         |
  |         15. Salad             $4.59         |
  |                                             |
  -----------------------------------------------
  """)

print_menu() 

def order():
  global item_num
  while True: 
    try: 
      item_num = int(input("How many items would you like to order? The minimum is 1 and the max is 5:"))
      if item_num < 1:
        print("Please order between 1 and 5 items")
        continue 
      if item_num > 5:
        print("Please order between 1 and 5 items")
        continue 
      else:
        break 
    except ValueError: 
      print("Please use numbers only")
      continue 

order() 

def itemChoice():
    for i in range(1,item_num+1): 
      while True: 
        try:
          which_item = int(input("Enter the number of the item you would like to add to your order:"))
          if which_item < 1: 
            print("Refer to menu for the item number")
            continue 
          if which_item > 15:
            print("Refer to menu for the item number")
            continue 
          else:
            item = which_item - 1 
            cost.append(prices[item]) 
            customerOrder.append(menu[item]) 
            global total_cost
            total_cost = round(sum(cost),2) 
            global grandTotal
            grandTotal = round(total_cost + deliveryCost, 2) 
            break 
        except ValueError: 
          print("Please use numbers only")
          continue 

itemChoice() 

def customerDetails(): 
  print ("")
  print ("CUSTOMER and ORDER DETAILS")
  print ("")
  print ("Name:", customer_name)
  print ("Phone number:", phone)
  print ("Address:", address)
  print ("        ", city)
  print ("        ", zipcode)
  print ("ORDER:", customerOrder)
  print ("Total: $", total_cost)
  print ("Total + Delivery: $", grandTotal)

customerDetails() 

print ("")
def confirm(): 
  confirmation = input("Enter Y to confirm your order, or enter N to reset the order:")
  confirmation = confirmation.upper() 
  if confirmation == "Y": 
    print("ORDER CONFIRMED")
  elif confirmation == "N": 
    print("ORDER CANCELLED - information has been reset")
    customerOrder[:] = []
    cost[:] = []
    print_menu()
    order()
    itemChoice()
    customerDetails()
    confirm()
  else:
    print("Please enter Y or N")
    confirm()

confirm()

def goodbye():
    print ("")
    print ("THANK YOU FOR YOUR ORDER")
    print ("Your order will be delivered in 15 minutes")
    bye = input("Type 'exit' to end the McDonald's Python ordering service:") 

print ("")
def orderAgain():
  order_more = input("Enter Z to order more, or enter X to exit the program:")
  order_more = order_more.upper() 
  if order_more == "Z":
    print_menu()
    order()
    itemChoice()
    customerDetails()
    confirm()
    goodbye()
  elif order_more == "X":
    goodbye()
  else:
    print ("Please enter X or Z")
    orderAgain() 

orderAgain()