我有一个项目列表: 例如:
a = ['IP 123 84', 'apple', 'mercury', 'IP 543 65', 'killer', 'parser', 'goat',
'IP 549 54 pineapple', 'django', 'python']
我想根据条件合并列表项,即合并所有项目,直到以IP开头的项目。 我想要的输出是:
a = ['IP 123 84 apple mercury', 'IP 543 65 killer parser goat',
'IP 549 54 pineapple django python']
请建议如何做到这一点。
答案 0 :(得分:2)
有趣的方式:
import itertools
def predicate_grouper(li, predicate='IP'):
indices = [i for i,x in enumerate(li) if x.startswith(predicate)]
slices = [slice(*x) for x in itertools.zip_longest(indices,indices[1:])]
for sli in slices:
yield ' '.join(li[sli])
演示:
list(predicate_grouper(a))
Out[61]:
['IP 123 84 apple mercury',
'IP 543 65 killer parser goat',
'IP 549 54 pineapple django python']
答案 1 :(得分:0)
如果字符串'IP'仅存在于a
的某些元素的头部,请加入列表然后将其拆分:
In [99]: ['IP'+i for i in ''.join(a).split('IP')[1:]]
Out[99]:
['IP 123 84applemercury',
'IP 543 65killerparsergoat',
'IP 549 54 pineappledjangopython']
如果a喜欢
a = ['IP 123 84', 'apple', 'mercury', 'IP 543 65', 'killer', 'parserIP', 'goat',
'IP 549 54 pineapple', 'django', 'python'] ^^^^
前一个解决方案不起作用,你可以插入一些特殊的序列(它应该永远不会出现在a中)到a,然后加入&拆分它:
In [11]: for i, v in enumerate(a):
...: if v.startswith('IP'):
...: a[i]='$$$'+v
...: ''.join(a).split('$$$')[1:]
Out[11]:
['IP 123 84applemercury',
'IP 543 65killerparsergoat',
'IP 549 54 pineappledjangopython']
答案 2 :(得分:0)
使用发电机。
def merge(x, key='IP'):
tmp = []
for i in x:
if (i[0:len(key)] == key) and len(tmp):
yield ' '.join(tmp)
tmp = []
tmp.append(i)
if len(tmp):
yield ' '.join(tmp)
a = ['IP 123 84','apple','mercury','IP 543 65','killer','parser','goat','IP 549 54 pineapple','django','python']
print list(merge(a))
['IP 123 84 apple mercury', 'IP 543 65 killer parser goat', 'IP 549 54 pineapple django python']
答案 3 :(得分:0)
import re
def group_IP_list(lst):
groups = []
word_group = []
for list_item in lst:
if re.search(r'^IP',list_item) and word_group:
groups.append(' '.join(word_group))
elif re.search(r'^IP',list_item):
word_group = [list_item]
else:
word_group.extend([list_item])
groups.append(' '.join(word_group))
return groups
#Usage:
a = ['IP 123 84','apple','mercury','IP 543 65','killer','parser','goat','IP 549 54 pineapple','django','python']
print group_IP_list(a)
#Result:
['IP 123 84 apple mercury', 'IP 123 84 apple mercury killer parser goat', 'IP 123 84 apple mercury killer parser goat django python']