如果它们相似且彼此相邻，则合并列表中的项目答案

【问题标题】：Merge items in list if they're alike and next to each other如果它们相似且彼此相邻，则合并列表中的项目
【发布时间】：2017-11-27 12:54:15
【问题描述】：

假设我有两个列表：

list_one = ["Alex", "Alex", "John", "Alex", "John", "John"]
list_two = ["Hi", "Are you there?", "Hello Alex!", "How are you John?", "I am good Alex", "How about yourself?"]

我想在列表一中合并相似的项目（称为列表三）

list_one = ["Alex", "Alex", "John", "Alex", "John", "John"]
list_three = ["Alex", "John", "Alex", "John"]

列表二变成列表四，遵循列表一中合并项目的“模式”：

list_two = ["Hi", "Are you there?", "Hello Alex!", "How are you John?", "I am good Alex", "How about yourself?"]
list_four = ["Hi Are you there?", "Hello Alex!", "How are you John?", "I am good Alex How about yourself?"]

我该怎么做？我找到了这个：Remove adjacent duplicate elements from a list，但它不处理多个列表，我不想从第二个列表中删除项目。

编辑：我找到了一个线程，我可以在其中获取列表中某个项目的所有实例，他们使用的代码是：

def all_indices(value, qlist):
indices = []
idx = -1
while True:
    try:
        idx = qlist.index(value, idx+1)
        indices.append(idx)
    except ValueError:
        break
return indices

现在，如果我为我的代码执行此操作，我会得到两个列表：

Alex = [0,1,3]
John = [2,4,5]

但是，如何编写一个将 list_two[0] 和 list_two[1] 组合在一起的函数？或者如果 Alex = [0,1,2,3,4,5]，我如何将所有这些组合成一个列表中的一项？

【问题讨论】：

标签： python python-2.7 list

【解决方案1】：

另一个groupby解决方案：

from itertools import groupby

list_one = ["Alex", "Alex", "John", "Alex", "John", "John"]
list_two = ["Hi", "Are you there?", "Hello Alex!", "How are you John?", "I am good Alex", "How about yourself?"]

l2iter = iter(list_two)
list_three, list_four = zip(*((key, ' '.join(next(l2iter) for whatever in grp)) for key, grp in groupby(list_one)))

【讨论】：