[英]Python - iterating through list and dictionary to get a nested list output
我有一个字典mydict
,其中包含一些文件名作为键和其中的文本作为值。
我正在从每个文件的文本中提取单词列表。 单词存储在列表mywords
。
我尝试了以下方法。
mydict = {'File1': 'some text. \n Foo extract this. \n Bar extract this',
'File2': 'more text. \n Bar extract this too.'}
mywords = ['Foo', 'Bar']
mylist= []
for k,v in mydict.items():
for word in mywords:
extracted = (re.findall('^ ' + word + ".*", v, flags=re.IGNORECASE|re.MULTILINE))
mylist.append(extracted[:1])
这给了我
[[' Foo extract this. '],
[' Bar extract this'],
[],
[' Bar extract this too.']]
但是,我希望每次在文件中搜索单词时输出都有 2 个嵌套列表(对于每个文件),而不是一个单独的列表。
期望的输出:
[[' Foo extract this. '], [' Bar extract this']],
[[], [' Bar extract this too.']]
您可能想尝试制作子列表并将它们附加到您的列表中。 这是一个可能的解决方案:
mydict = {'File1': 'some text. \n Foo extract this. \n Bar extract this',
'File2': 'more text. \n Bar extract this too.'}
mywords = ['Foo', 'Bar']
mylist= []
for k,v in mydict.items():
sublist = []
for word in mywords:
extracted = (re.findall('^ ' + word + ".*", v, flags=re.IGNORECASE|re.MULTILINE))
sublist.append(extracted[:1])
mylist.append(sublist)
这输出: [[[' Foo extract this. '], [' Bar extract this']], [[], [' Bar extract this too.']]]
[[[' Foo extract this. '], [' Bar extract this']], [[], [' Bar extract this too.']]]
如果您想要没有周围列表的字符串,请仅在有结果时插入第一个结果:
import re
mydict = {'File1': 'some text. \n Foo extract this. \n Bar extract this',
'File2': 'more text. \n Bar extract this too.'}
mywords = ['Foo', 'Bar']
mylist= []
for k,v in mydict.items():
sublist = []
for word in mywords:
extracted = (re.findall('^ ' + word + ".*", v, flags=re.IGNORECASE|re.MULTILINE))
if extracted: # Checks if there is at least one element in the list
sublist.append(extracted[0])
mylist.append(sublist)
这输出: [[' Foo extract this. ', ' Bar extract this'], [' Bar extract this too.']]
[[' Foo extract this. ', ' Bar extract this'], [' Bar extract this too.']]
如果您希望能够从每个文件中获得多个结果,您可以执行以下操作(请注意,我在第二个文件中为Foo
放置了另一个匹配项:
import re
mydict = {'File1': 'some text. \n Foo extract this. \n Bar extract this',
'File2': 'more text. \n Bar extract this too. \n Bar extract this one as well'}
mywords = ['Foo', 'Bar']
mylist= []
for k,v in mydict.items():
sublist = []
for word in mywords:
extracted = (re.findall('^ ' + word + ".*", v, flags=re.IGNORECASE|re.MULTILINE))
if extracted:
sublist += extracted
mylist.append(sublist)
这输出: [[' Foo extract this. ', ' Bar extract this'], [' Bar extract this too. ', ' Bar extract this one as well']]
[[' Foo extract this. ', ' Bar extract this'], [' Bar extract this too. ', ' Bar extract this one as well']]
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