I have to do the following:

• Use a list to take order item key with quantity.
• Sample List format for order taken:[[1,2], [3,1]] meaning item Big Mac (id 1) has quantity 2 and item Vegetarian Burger (id 3) has quantity 1 ordered. You will create an empty list before a loop starts, then add a nested listeach time an order entered with id and quantity by appending your list.

Here is what I have so far, but I'm getting really confused on how to add a nested list and append. Thank you in advanced!

def processOrder(quantity, item_list):
    global total
    if quantity > item_list[2]:
        print("There is not enough stock!")
        pass
    else:
        total  = item_list[1] * quantity
        item_list[2] -= quantity


total = 0
A = ["Big Mac", float(2.50), 50], ["Large Fries", float(0.50), 200], ["Vegetarian Burger", float(1.00), 20]

print("Welcome to McDonald's")
print("[1]", A[0][0:2],
      "\n[2]", A[1][0:2],
      "\n[3]", A[2][0:2])

order_list = []
nested_order_list = [[],[]]
more_items = "yes"

while more_items == "yes":
    choice, quantity =(int(input("\nWhat would you like?\n"))), int(input("\nHow many would you like?\n")) #asking twice 
    nested_order_list.append()
    if 1 <= choice <= 3:
        processOrder(quantity, A[choice-1]) #list item is big mac = 0; want to send whole list over there, but index must be -1

    more_items = (input("Do you want to order more items?")).lower()


print("Thank you for ordering!\nYour total cost is: $"    str(total))