python小作业4-商品购买

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products = [["iphone", 6888], ["MacPro", 14800], ["小米6", 2499], ["Coffee", 31], ["Book", 60], ["Nike", 699]]
print("题目products :%s" %(products))

j = 0
for product in products:
    print(j, end="t")
    print(product[0], end="t")
    print(product[1])
    j += 1
# -------------------------------------------------------------------------------
cart = [["iphone", 0, 6888], ["MacPro", 0, 14800], ["小米6", 0, 2499], ["Coffee", 0, 31], ["Book", 0, 60],
        ["Nike", 0, 699]]
# -------------------------------------------------------------------------------

# 1、展示商品：
print("商品列表如下：")
k = 0
for product in products:
    print(k, end="t")
    print(product[0], end="t")
    print(product[1])
    k += 1
# -------------------------------------------------------------------------------

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# 2、商品购买循环：
while 1:
    new_goods_index = input("请输入你要购买的商品编号，按q可退出购买界面：")
    if new_goods_index == 'q':
        break
    elif (new_goods_index.isdigit() == False) or ((0 <= int(new_goods_index) <= 5) == False):
        print("输入异常，请重新输入！")
        continue
    elif int(new_goods_index) == 0:
        cart[0][1] += 1
    elif int(new_goods_index) == 1:
        cart[1][1] += 1
    elif int(new_goods_index) == 2:
        cart[2][1] += 1
    elif int(new_goods_index) == 3:
        cart[3][1] += 1
    elif int(new_goods_index) == 4:
        cart[4][1] += 1
    elif int(new_goods_index) == 5:
        cart[5][1] += 1
    else:
        continue
# -------------------------------------------------------------

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# 3、打印用户购买的商品列表
print(cart)

s1 = "商品名"
s2 = "数量"
s3 = "单价"
s4 = "合计"
pay = 0

print("您购买的商品列表如下：")
print("%-30s%-30s%-30s%-30s" % (s1, s2, s3, s4))
for stuff in cart:
    print("%-30s%-30s%-30s%-30s" % (stuff[0], stuff[1], stuff[2], stuff[1] * stuff[2]))
    pay += stuff[1] * stuff[2]
print("您要支付的总金额为：%d元" % (pay))