[已解决]请问我这段代码哪错了

jiuridi

1. products = [['iPhone','6888'],["MacPro","14800"],["coffee","31"],["book","61"],["nike","699"]]
   
2. buy_shopping = []
   
3. print('以下为产品序号')
   
4. for i in range(len(products)):
   
5.     print(i,products[i])
   
6. a= int(input("请输入要购买的商品序号"))
   
7. buy_shopping.append(products.index(a))
   
8. print("已将商品添加到购物车，现在购物车里有%s"%buy_shopping)
   
9. 
   

复制代码

最佳答案

月排行榜 / 总排行榜

qiuyouzhi

2020-4-9 13:29:36

你要么搞成一个字典，要么就把序号也放进列表里
你这个i是和列表内的商品分开打印的，列表里面没有i
或者直接索引也行，但我喜欢字典
可以改成这样：

1. products = {0:['iPhone','6888'],1:["MacPro","14800"],2:["coffee","31"],3:["book","61"],4:["nike","699"]}
   
2. buy_shopping = []
   
3. print('以下为产品序号')
   
4. for each in products:
   
5.     print(each, products[each])
   
6. a= int(input("请输入要购买的商品序号"))
   
7. buy_shopping.append(products[each])
   
8. print("已将商品添加到购物车，现在购物车里有%s"%buy_shopping)

复制代码

当然，为了美观，建议把倒数第二行的append改成extend

1. products = {0:['iPhone','6888'],1:["MacPro","14800"],2:["coffee","31"],3:["book","61"],4:["nike","699"]}
   
2. buy_shopping = []
   
3. print('以下为产品序号')
   
4. for each in products:
   
5.     print(each, products[each])
   
6. a= int(input("请输入要购买的商品序号"))
   
7. buy_shopping.extend(products[each])
   
8. print("已将商品添加到购物车，现在购物车里有%s"%buy_shopping)

复制代码

还可以：

1. products = [['iPhone', '6888'], ["MacPro", "14800"], ["coffee", "31"], ["book", "61"], ["nike", "699"]]
   
2. buy_shopping = []
   
3. print('以下为产品序号')
   
4. for i in range(len(products)):
   
5.     print(i, products[i][0], products[i][1])
   
6. a = int(input("请输入要购买的商品序号"))
   
7. buy_shopping.extend(products[a])
   
8. print("已将商品添加到购物车，现在购物车里有%s" % buy_shopping[0] + ' 价格为 ' + buy_shopping[1])

复制代码

这是最美观的一种，推荐！

跳转到最佳答案楼层

qiuyouzhi

你要么搞成一个字典，要么就把序号也放进列表里
你这个i是和列表内的商品分开打印的，列表里面没有i
或者直接索引也行，但我喜欢字典
可以改成这样：

1. products = {0:['iPhone','6888'],1:["MacPro","14800"],2:["coffee","31"],3:["book","61"],4:["nike","699"]}
   
2. buy_shopping = []
   
3. print('以下为产品序号')
   
4. for each in products:
   
5.     print(each, products[each])
   
6. a= int(input("请输入要购买的商品序号"))
   
7. buy_shopping.append(products[each])
   
8. print("已将商品添加到购物车，现在购物车里有%s"%buy_shopping)

复制代码

当然，为了美观，建议把倒数第二行的append改成extend

1. products = {0:['iPhone','6888'],1:["MacPro","14800"],2:["coffee","31"],3:["book","61"],4:["nike","699"]}
   
2. buy_shopping = []
   
3. print('以下为产品序号')
   
4. for each in products:
   
5.     print(each, products[each])
   
6. a= int(input("请输入要购买的商品序号"))
   
7. buy_shopping.extend(products[each])
   
8. print("已将商品添加到购物车，现在购物车里有%s"%buy_shopping)

复制代码

还可以：

1. products = [['iPhone', '6888'], ["MacPro", "14800"], ["coffee", "31"], ["book", "61"], ["nike", "699"]]
   
2. buy_shopping = []
   
3. print('以下为产品序号')
   
4. for i in range(len(products)):
   
5.     print(i, products[i][0], products[i][1])
   
6. a = int(input("请输入要购买的商品序号"))
   
7. buy_shopping.extend(products[a])
   
8. print("已将商品添加到购物车，现在购物车里有%s" % buy_shopping[0] + ' 价格为 ' + buy_shopping[1])

复制代码

这是最美观的一种，推荐！

zltzlt

不要用 index()，直接用索引

1. products = [['iPhone', '6888'], ["MacPro", "14800"], ["coffee", "31"], ["book", "61"], ["nike", "699"]]
   
2. buy_shopping = []
   
3. print('以下为产品序号')
   
4. for i in range(len(products)):
   
5.     print(i, products[i])
   
6. a = int(input("请输入要购买的商品序号"))
   
7. buy_shopping.append(products[a])    # 修改
   
8. print("已将商品添加到购物车，现在购物车里有%s" % buy_shopping)

复制代码

heidern0612

老男孩教育？