L1 =[‘a‘,‘b‘,‘c‘,‘d‘,1,2,3,4,5,6,‘b‘,‘D‘]
for i in L1:
    print(i)

for i in range(5,10):
    print(i)

#1
names = [‘jiu‘,‘lin‘,‘liang‘,‘kun‘,‘ting‘]
#2
names.insert(0,"small")
#3
names[0] = "九"
#4
names.append([‘good‘,‘like‘])
#5
print(names.index("kun"))
#6
names_1 = [1,2,3,4,5,6,2]
names = names + names_1
#7
print(names[4:7])
#8
print(names[2:10:2])
#9
print(names[-3:])
#10
#enumerate 的意思是枚举，获取元素的索引值
for index,l  in enumerate(names): 
    print(index,l)

#11
for index,l  in enumerate(names):
    if index %2 == 0:
        names[index] = -1
print(names)
#12
names = [‘jiu‘,‘lin‘,‘liang‘,2,‘kun‘,2,‘ting‘]
a = names.index(2)
names_1 = names[a+1:]
b = names_1.index(2)
print("2的索引位置为",a+b+1)

products = [["iphone8","6888"],["MacPro","14800"],["小米6","2488"],["Book","80"],["Niike","888"]]
leng = len(products)
run = True
shop_list = []
while run:
    print("-------商品列表------")
    for index,l in enumerate(products):
        print ("%s %s    %s" %(index,l[0],l[1]))
    user_1 = input("请输入你购买的商品序号》》：")
    if user_1.isdigit():
        user_1 = int(user_1)
        if user_1 >= 0 and user_1 < leng:
            shop_list.append(products[user_1])
            print("你购买了",products[user_1])
        else:
             print("请输入正确商品序号")
    elif user_1 == "q":
        if len(shop_list) == 0:
            print("你的购物车是空的")
        else:
            print("--------购物车---------")
            for index,l in enumerate(shop_list):
                print (index,l[0],l[1])
        run = False