串联属于某些值的列表元素之间的列表元素 [英] Concatenate list elements that fall between list elements of certain value

问题描述

想象一下，我有以下列表:

Imagine I have the following list:

>>> mylist

[('a', u'DT'),
 ('Satisfactory', u'JJ'),
 ('tracing', u'VBG'),
 ('with', u'IN'),
 ('a', u'DT'),
 ('fairly', u'RB'),
 ('persistent', u'JJ'),
 ('with', u'IN')]

如何串联属于包含u'IN'或u'DT'的元素之间的列表项，并且仅返回串联的元素，即:

How do I concatenate list items that fall between elements that contain u'IN' or u'DT' and return only the concatenated elements i.e:

[('Satisfactory tracing'),
 ('fairly persistent')]

推荐答案

以下是一种可以为您提供所需结果的工具.也许您需要对其进行一些优化.

Here is one which shall give you the desired result. Maybe you need to optimize it a bit.

my_list = ([('a', u'DT'),
            ('Satisfactory', u'JJ'),
            ('tracing', u'VBG'),
            ('with', u'IN'),
            ('a', u'DT'),
            ('fairly', u'RB'),
            ('persistent', u'JJ'),
            ('with', u'IN')])

sequence_enable = False
new_list = []
for i in my_list:
    if i[1] == 'DT' or i[1] == 'IN':
        if not sequence_enable: # Start reading values 
            sequence_enable = True
            temp_str = []
        else: # stop reading values
            new_list.append(' '.join(temp_str)) 
            sequence_enable = False

        continue
    else: # store values
        if sequence_enable:
            temp_str.append(i[0])

print(new_list)
# output: ['Satisfactory tracing', 'fairly persistent']

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