[Python知识库]Python学习笔记：购物车问题

代码如下，没有借鉴其他代码，可能过于复杂：

products = [["iphone", 6888], ["MacPro", 14800], ["小米6", 2499], ["Coffee", 31], ["Book", 60], ["Nike", 699]]
print("-" * 5 + "  商品列表  " + "-" * 5)
for i in range(6):                  # 输出商品列表
    print(i, end="\t")
    print(products[i][0], end="\t")
    print(products[i][1], end="\t")
    print()
Trolley = []    # 购物车，该列表用于储存列表，即以列表为元素
Shopping = []   # 商品，用于存储顾客现在想购买的商品信息，只存储一个商品的信息，随后置空
ShoppingNum = input("请输入您想购买的商品编号：")
while ShoppingNum != "q":
    v = [x[0] for x in Trolley]     # 取Trolley列表的第一列元素
    if ShoppingNum in v:            # 如果有重复商品，将商品数量加一即可
        n = v.index(ShoppingNum)
        Trolley[n][3] += 1
    else:                           # 没有重复商品，将商品信息存入Shopping，再将Shopping存入Trolley，随后将Shopping置空
        Shopping.append(ShoppingNum)
        Shopping.append(products[int(ShoppingNum)][0])
        Shopping.append(products[int(ShoppingNum)][1])
        Shopping.append(1)      # 新商品数量置为1
        Trolley.append(Shopping)
        Shopping = []
    ShoppingNum = input("请输入您想购买的商品编号：")
print("-" * 5 + "  购物车  " + "-" * 5)
for i in range(len(Trolley)):
    print(Trolley[i][0], end="\t")
    print(Trolley[i][1], end="\t")
    print(Trolley[i][2], " ", end="\t")     # 格式化输出购物车列表，由于商品编码为1的商品价格超过4位数少于8位数，故在价格后加空格
    print("*", Trolley[i][3], end="\t\t")
    print()

?运行效果如下：