2-4 list练习题

参考答案

>>> names = []
>>> names.append('old_driver')
>>> names.append('rain')
>>> names.append('jack')
>>> names.append('shanshan')
>>> names.append('peiqi')
>>> names.append('black_girl')
>>> names
['old_driver', 'rain', 'jack', 'shanshan', 'peiqi', 'black_girl']

>>> dir(names)
['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__
', '__hash__', '__iadd__', '__imul__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__',
'__reversed__', '__rmul__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'append', 'clear', 'copy', 'count', 'extend', 'index', 'insert', '
pop', 'remove', 'reverse', 'sort']

>>> names.index('black_girl')
5
>>> names.insert(5,'alex')
>>> names
['old_driver', 'rain', 'jack', 'shanshan', 'peiqi', 'alex', 'black_girl']

>>> names[names.index('shanshan')] = '姗姗'
>>> names
['old_driver', 'rain', 'jack', '姗姗', 'peiqi', 'alex', 'black_girl']

>>> names2
['oldboy', 'oldgirl']
>>> names.index('rain')
1
>>> names.insert(2,names2)
>>> names
['old_driver', 'rain', ['oldboy', 'oldgirl'], 'jack', '姗姗', 'peiqi', 'alex', 'black_girl']

>>> names.index('peiqi')
5

>>> names3 = [1,2,3,4,2,5,6,2]
>>> names.extend(names3)
>>> names
['old_driver', 'rain', ['oldboy', 'oldgirl'], 'jack', '姗姗', 'peiqi', 'alex', 'black_girl', 1, 2, 3, 4, 2, 5, 6, 2]

>>> names4 = names + names3
>>> names4
['old_driver', 'rain', ['oldboy', 'oldgirl'], 'jack', '姗姗', 'peiqi', 'alex', 'black_girl', 1, 2, 3, 4, 2, 5, 6, 2]

>>>  names.append(names3)
>>> names
['old_driver', 'rain', ['oldboy', 'oldgirl'], 'jack', '姗姗', 'peiqi', 'alex', 'black_girl', [1, 2, 3, 4, 2, 5, 6, 2]]

>>> names[4:8]
['姗姗', 'peiqi', 'alex', 'black_girl']
>>>

>>> names[2:11:2]
[['oldboy', 'oldgirl'], '姗姗', 'alex', [1, 2, 3, 4, 2, 5, 6, 2]]
>>>
>>> names[-3:]
['alex', 'black_girl', [1, 2, 3, 4, 2, 5, 6, 2]]

10

>>> for k in names:
...     print(names.index(k),k)

names3 = ['old_driver', 'rain', 'jack', 'shanshan', 'peiqi', 'black_girl']

count = 0
for i in names3:
    print(count,i)
    count += 1

0 old_driver
1 rain
2 ['oldboy', 'oldgirl']
3 jack
4 姗姗
5 peiqi
6 alex
7 black_girl
8 [1, 2, 3, 4, 2, 5, 6, 2]

for i in enumerate(names3):  #枚举
    print(i)

# 运行结果
(0, 'old_driver')
(1, 'rain')
(2, 'jack')
(3, 'shanshan')
(4, 'peiqi')
(5, 'black_girl')

for index,item in enumerate(names3):  #枚举
    print(index,item)

# 运行结果
0 old_driver
1 rain
2 jack
3 shanshan
4 peiqi
5 black_girl

11

names = ['old_driver', 'rain', ['oldboy', 'oldgirl'], 'jack', '姗姗', 'peiqi', 'alex', 'black_girl', [1, 2, 3, 4, 2, 5, 6, 2]]

for k in names:
    index = names.index(k)
  if index%2 == 0:
      names[index] = -1
      print(index, k)
print(names)

names3 = ['old_driver', 'rain', 'jack', 'shanshan', 'peiqi', 'black_girl']

for index,item in enumerate(names3):
    if index%2 == 0:
        print(index,item)
        names3[index] = -1
print(names3)

12

　　

　　

13

product = [['Iphone8', 6888], ['MacPro', 14800], ['小米6', 2499], ['Coffee', 31], ['Book', 80], ['Nike Shoes', 799]]
print("----------商品列表 --------")
for index,item in enumerate(product):
    msg = "%s. %s   %s"%(index, product[index][0], product[index][-1])
　　print(msg)

　　

product = [['Iphone8', 6888], ['MacPro', 14800], ['小米6', 2499], ['Coffee', 31], ['Book', 80], ['Nike Shoes', 799]]
print("----------商品列表 --------")
for index,item in enumerate(product):
    msg = "%s. %s   %s"%(index, item[0], item[-1])
    print(msg)

购物车程序

　　

# -*- coding:utf-8 -*-

product = [['Iphone8', 6888], ['MacPro', 14800], ['小米6', 2499], ['Coffee', 31], ['Book', 80], ['Nike Shoes', 799]]
shopping_cart = []

flag = False  # 标志位
while not flag:
    print("----------商品列表 --------")
    for index, item in enumerate(product):
        msg = "%s. %s   %s" % (index, item[0], item[-1])
        print(msg)
    choice = input("输入你要买的商品编号|退出q ：")
    if choice.isdigit():
        choice = int(choice)
        if choice < len(product):
            shopping_cart.append(product[choice])
            print('-----你购买了',product[choice])
        else:
            print('你输入的商品不存在')
    elif choice == 'q':
        if len(shopping_cart) > 0:
            print("------你的购物车---------")
            for index, item in enumerate(shopping_cart):
                msg = "%s. %s   %s" % (index, item[0], item[-1])
                print(msg)
        flag = True
        # break
    else:
        print('你输入的有误，请重新输入')