#Hi Ryan, here's my example on basic Python Programming

import os
clear = lambda: os.system('cls')

Menu2 = {
    "Burger": 2,
    "Watermelon": 5,
    "FriedBanana": 1,
    "Milk": 1.50
}
title = "Welcome to Mc Walnonds"
border = "----------------------------------------------------"
Nods = ["Y","y","yes","Yes","YES"]

print(title)
Q = input("Are you an existing user?")
if Q in Nods:
    User = input("Username:")
    Password = input("Password:")
    if User == "r" and Password == "r":
        clear()
        print("Hello", User)
        print(title)
        print(border,"\nMenu:")
        for x, y in Menu2.items():
            print(x, str(y))
        print("\nPlease State Your Orders?")
        Orderlist = []
        i = -1
        while True:
            Order = input()

            if Order in Menu2:
                Orderlist.append(Order)
                Quantity = input("Quantity?")
                Orderlist.append(Quantity)
                i = i + 2
                print("Order:", Orderlist)
            elif Order in ("E","e","Exit"):
                Cancel = input("Do you wish to cancel your order")
                if Cancel in Nods:
                    Orderlist.clear()
                else:
                    ()
            elif Order == "Undo":
                if i > -1:
                    del Orderlist[i-1:i+1]
                    print(i)
                    i = i - 2
                    print("Order:", Orderlist)
                else:
                    print("Your Order List is already empty")
            elif Order not in Menu2:
                print("Sorry, the item is unavailable")

elif Q not in Nods:
    print("Register?")