点菜

打印菜单

数字点菜

显示所点

计算花费

"""order food"""
# the food name and the price
menu = [['done and exit', ''], ['dan chao fan', 8], ['hui guo rou', 14], ['qing zheng yu', 18]]


def print_menu(menu):
    """ print the sequence and the food name and the price.  """

    menu_len = len(menu)
    for i in range(0, menu_len):
        print "%d  %s %s" % (i, menu[i][0].ljust(20), menu[i][1])


def get_orders():
    """  get the order num.  """

    print
    orders = []
    while  True:
        num = raw_input('input you choice:')
        if num == '0':
            return orders
        else:
            orders.append(int(num))


def print_orders(orders, menu):
    """print customer order list"""

    print
    print "you have order:"
    for i in orders:
        print menu[i][0], menu[i][1]


def compute_cost(orders, menu):
    """print the total cost of order foods"""

    print
    cost = 0
    for i in orders:
        cost += menu[i][1]
    print "the total cost is: %s" % cost

print_menu(menu)
orders = get_orders()
print_orders(orders, menu)
compute_cost(orders, menu)