#所有元素全部单独输出

li = [1,2,3,'taibai',[4,5,6,'taibaia']]

for i in li:

    if type(i) == list:

        for k in i:

            print(k)

    else:

        print(i)

或

for i in range (len(li)):

    if type(li[i]) == list:

        for j in li[i]:

            print(j)

    else:print(li[i])

#统计字母中数字的个数

info = input('>>>')

for i in info:

     if i.isalpha():

          info = info.replace(i," ")

l = info.split()

print(len(l))

#将大于66数放入字典第一个key中，将小于66数放入字典第二个key中

li = [11,22,33,44,55,66,77,88,99,90]

dic = {}

li_big = []

li_small = []

for i in li:

     if i > 66:

          li_big.append(i)

     elif i == 66:

          continue

     else:

          li_small.append(i)

dic.setdefault('k1',li_big)

dic.setdefault('k2',li_small)

print(dic)#{'k1': [77, 88, 99, 90], 'k2': [11, 22, 33, 44, 55]}

#输出商品列表，用户输入序号，显示用户选中的商品。

flag = True

while flag:

    li = ["手机","电脑","鼠标垫","游艇"]

    for i in li:

        print('{}\t\t {}'.format(li.index(i)+1,i))

    num_of_you = input('请输入序号（若退出，空格退出）：')

    if num_of_you  == '':

        break

    elif num_of_you.isdigit():#判断是否是数字

        num_of_you = int(num_of_you)

        if num_of_you >0 and num_of_you <= len(li):#判断数字长度

            print(li[num_of_you-1])

        else:

            print('输入数字过大，请重新输入。')

            continue

    else:

        print('您输入有误，请重新输入。')

        continue

#购物车

li = [{'name':'手机','price':''},

      {'name': '平板', 'price': ''},

      {'name':'电视','price':''},

      {'name':'电脑','price':''},

      ]

money_of_you = input('请输入您拥有的金额：')

surplus = money_of_you

shopping_car = {}

while 1:

    if money_of_you.isdigit() and int(money_of_you)>0:

       for i,j in enumerate(li):

           print('序号{},名称{},价格{}'.format(i,li[i]['name'],li[i]['price']))

       choose = input('请输入想购买的序号(若退出直接回车)：')

       if choose.isdigit() and int(choose)<len(li) and int(choose)>=0:

            num = input('需要购买的数量：')

            if num.isdigit() and int(num)>0:

                if int(surplus)>int(li[int(choose)]['price']) * int(num):

                    surplus = int(surplus) - int(li[int(choose)]['price']) * int(num)#剩余金额

                    if li[int(choose)]['name'] in shopping_car:#将相同的放一起

                        shopping_car[li[int(choose)]['name']] = shopping_car[li[int(choose)]['name']] + int(num)

                    else:

                        shopping_car[li[int(choose)]['name']] = int(num)

                    print('您购物车商品有{}，剩余金额为{}'.format(shopping_car,surplus))

                else:

                    print('余额不足！')

                    print('您购物车商品有{}，剩余金额为{}'.format(shopping_car,surplus))

                    break

            else:

                print('输入数量有误，请重新输入。')

                continue

       elif choose == '':

           print('您购物车商品有{}，剩余金额为{}'.format(shopping_car, surplus))

           break

       else:

           print('购物车中未有您输入的序号，请重新输入：')

           continue

    else:

        print('您输入不是金额，请重新输入：')

        continue