2 -4 -1 list列表练习解答

>>> 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‘]

#list方法
>>> 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‘)
>>> 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]]

>>> 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
#运行结果
old_driver
rain
[‘oldboy‘, ‘oldgirl‘]
jack
姗姗
peiqi
alex
black_girl
[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
old_driver
rain
jack
shanshan
peiqi
black_girl

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)

product = [[‘iphone‘,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)

#运行结果
-----商品列表-----
0 iphone 6888
1 macpro 14800
2 小米6 2499
3 coffee 31
4 book 80
5 nike shoes 799

Process finished with exit code 0

product = [[‘iphone‘,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)

#运行结果
-----商品列表-----
0 iphone 6888
1 macpro 14800
2 小米6 2499
3 coffee 31
4 book 80
5 nike shoes 799

Process finished with exit code 0

product = [[‘iphone‘,6888],[‘macpro‘,14800],[‘小米6‘,2499],[‘coffee‘,31],[‘book‘,80],[‘nike shoes‘,799]]
shopping_cart = []
while True:
    print("------商品列表------")
    for index,i in enumerate(product):
        print("%s  %s  %s"%(index,i[0],i[1]))
    choose = input("输入商品编号（0-5），退出（q）")
    if choose.isdigit():
        choose =int(choose)
        if choose < len(product):
            shopping_cart.append(product[choose])
            print("商品已加入购物车！%s" %(product[choose]))
        else:
            print("输入有误，商品不存在")
    elif choose == ‘q‘:
        if len(shopping_cart) > 0:
            print("-----你的购物车------")
            for index ,p in enumerate(shopping_cart):
                print("%s   %s   %s   "%(index,p[0],p[1]))
        break
    else:
        print("输入有误，请重新输入")

#运行结果
输入商品编号（0-5），退出（q）2
商品已加入购物车！[‘小米6‘, 2499]
------商品列表------
0  iphone  6888
1  macpro  14800
2  小米6  2499
3  coffee  31
4  book  80
5  nike shoes  799
输入商品编号（0-5），退出（q）q
-----你的购物车------
0   macpro   14800   
1   小米6   2499   
Process finished with exit code 0