shangpinchengyu = ["手机", "电脑", "鼠标垫", "游艇" ]
while 1==1:
choose = input("需要添加商品序号请按1，需要选择商品请按2,需要展示所有商品请按3")
if(choose=="1"):
xuhao = int(input("请输入你要选择的商品序号"))
if(xuhao>=len(shangpinchengyu)):
print("输入不正确")
continue
print(shangpinchengyu[xuhao])
elif(choose=="2"):
shangpin = input("请输入要添加的商品")
for item in shangpinchengyu:
if(item == shangpin):
print('商品已存在')
continue
shangpinchengyu.append(shangpin)
elif (choose == "3"):
for item in shangpinchengyu:
print(item)
else:
print("输入不正确")

arr=[11,22,33,44,55,66,77,88,99,90]
dict1 = {'key1':[],'key2':[]}
for item in arr:
if(item<66):
dict1["key1"].append(item)
else:
dict1["key2"].append(item)