在python中对两个列表进行分组

时间:2014-12-18 14:39:06

标签: python list

我有两个列表,我想根据列表的第一个元素进行分组。

list1 = [['1','abc','zef'],['2','qwerty','opo'],['3','lol','pop']]

list2 = [['1','rofl','pole'],['2','sole','pop'],['3','lmao','wtf']]

此处列表中列表中的第一个元素是' 1' ,' 2'和' 3'。

我希望我的最终名单如下: -

Final_List = [['1', 'abc', 'zef', 'rofl', 'pole'], ['3', 'lol', 'pop', 'lmao', 'wtf'], ['2', 'qwerty', 'opo', 'sole', 'pop']]

我已尝试使用以下代码。

#!/usr/bin/python
list1 = [['1','abc','zef'],['2','qwerty','opo'],['3','lol','pop']]
list2 = [['1','rofl','pole'],['2','sole','pop'],['3','lmao','wtf']]
d = {}
for i in list1:
    d[i[0]] = i[1:]
for i in list2:
    d[i[0]].extend(i[1:])
Final_List = []
for key, value in d.iteritems():
    value.insert(0,key)
   Final_List.append(value)

此代码有效,但我想知道是否有一种简单易用的方法

任何帮助?

8 个答案:

答案 0 :(得分:5)

我会像你写的那样写一些修改,比如这个

  1. 准备一个字典,其中包含与第一个元素对应的第二个位置的所有元素。

    d = {}
    for items in (list1, list2):
        for item in items:
            d.setdefault(item[0], [item[0]]).extend(item[1:])
    
  2. 然后只需从字典中获取所有值(感谢@jamylak): - )

    print(d.values())
    
  3. <强>输出

    [['3', 'lol', 'pop', 'lmao', 'wtf'],
     ['1', 'abc', 'zef', 'rofl', 'pole'],
     ['2', 'qwerty', 'opo', 'sole', 'pop']]
    

答案 1 :(得分:1)

如果Final_List内的列表中的项目顺序不重要,则可以使用此项,

[list(set(sum(itm, []))) for itm in zip(list1, list2)]

答案 2 :(得分:0)

是的,列表理解和枚举

list1 = [['1','abc','zef'],['2','qwerty','opo'],['3','lol','pop']]

list2 = [['1','rofl','pole'],['2','sole','pop'],['3','lmao','wtf']]

print [set(v + list2[k]) for k,v in enumerate(list1)]

[['1', 'abc', 'zef', 'rofl', 'pole'], ['2', 'qwerty', 'opo', 'sole', 'pop'], ['3', 'lol', 'pop', 'lmao', 'wtf']]

修改

具有索引关系

list1 = [['1','abc','zef'],['2','qwerty','opo'],['3','lol','pop']]
list2 = [['1','rofl','pole'],['3','lmao','wtf'],['2','sole','pop']]

d1 = {a[0]:a for a in list1}
d2 = {a[0]:a for a in list2}
print [set(v + d2[k]) for k, v in d1.items()]

答案 3 :(得分:0)

您的代码似乎正确无误。只需修改以下部分:

Final_List = []    
for key in d:
    L = [key] + [x for x in d[key]]
    Final_List.append(L)

答案 4 :(得分:0)

使用默认字典和列表推导可以缩短代码

from collections import defaultdict

list1 = [['1','abc','zef'],['2','qwerty','opo'],['3','lol','pop']]
list2 = [['1','rofl','pole'],['2','sole','pop'],['3','lmao','wtf']]

d = defaultdict(list)

for i in list1 + list2:
    d[i[0]].extend(i[1:])

Final_List = [[key] + value for key, value in d.iteritems()]

print Final_List

答案 5 :(得分:0)

list3 = []
for i in xrange(0,max(len(list1[0]), len(list2[0]))):
    list3.append(list(list1[i]))
    list3[i].extend(x for x in list2[i] if x not in list3[i])

使用xrange,您只能在列表中迭代一次。

答案 6 :(得分:0)

一些功能风格:

import operator, itertools
from pprint import pprint
one = [['1','abc','zef'],['2','qwerty','opo'],['3','lol','pop']]
two = [['1','rofl','pole'],['2','sole','pop'],['3','lmao','wtf']]

一些帮手:

zero = operator.itemgetter(0)
all_but_the_first = operator.itemgetter(slice(1, None))
data = (one, two)

def foo(group):
    # group is (key, iterator) from itertools.groupby
    key = group[0]
    lists = group[1]
    result = list(key)
    for item in lists:
        result.extend(all_but_the_first(item))
    return result

处理daa的函数

def process(data, func = foo):
    # concatenate all the sublists
    new = itertools.chain(*data)
    # group by item zero
    three = sorted(new, key = zero)
    groups = itertools.groupby(three, zero)
    # iterator that builds the new lists
    return itertools.imap(foo, groups)

用法

>>> pprint(list(process(data)))

[['1', 'abc', 'zef', 'rofl', 'pole'],
 ['2', 'qwerty', 'opo', 'sole', 'pop'],
 ['3', 'lol', 'pop', 'lmao', 'wtf']]
>>>
>>> for thing in process(data):
    print thing

['1', 'abc', 'zef', 'rofl', 'pole']
['2', 'qwerty', 'opo', 'sole', 'pop']
['3', 'lol', 'pop', 'lmao', 'wtf']
>>>

答案 7 :(得分:0)

list1 = [[&#39; 1&#39;,&#39; abc&#39;,&#39; zef&#39;],[&#39; 2&#39;,&#39; qwerty& #39;,&#39; OPO&#39;],[&#39; 3&#39;&#39;洛尔&#39;&#39;弹出&#39;]]

list2 = [[&#39; 1&#39;,&#39; rofl&#39;,&#39; pole&#39;],[&#39; 2&#39;,&#39; sole& #39;,&#39;弹出&#39;],[&#39; 3&#39;&#39; LMAO&#39;&#39;跆拳道&#39;]]

Final_List = []

表示范围内的i(0,len(list1)):

    Final_List.append(list1[i] + list2[i])

    del Final_List[i][3]

打印Final_List

<强>输出

[[&#39; 1&#39;,&#39; abc&#39;,&#39; zef&#39;,&#39; rofl&#39;,&#39; pole&#39;] ,[&#39; 2&#39;,&#39; qwerty&#39;,&#39; opo&#39;,&#39; sole&#39;,&#39; pop&#39;],[& #39; 3&#39;,&#39; lol&#39;,&#39; pop&#39;,&#39; lmao&#39;,&#39; wtf&#39;]]