Question

我有一个字符串列表。每个字符串都包含我需要的特定字符序列 - 我正在寻找三到四个确切的序列 - 其余的包含需要从字符串中消除的不可预测的数据。即：序列= [＆＃39; sequenceA＆＃39;，＆＃39; sequenceB＆＃39;，＆＃39; sequenceC＆＃39;] bigList = [＆＃39;垃圾序列B blahblah＆＃39;，＆＃39; sequenceA废话＆＃39;，＆＃39; silliness sequenceC＆＃39;，＆＃39;总废话＆＃39;] goalList = [＆＃39; sequenceB＆＃39;，＆＃39; sequenceA＆＃39;，＆＃39; sequenceC＆＃39;，＆＃39;＆＃39;] 我可以使用sub或.replace来删除特定字符，但这是反转：我需要删除所有特定字符串的所有内容，对于没有特定序列实例的列表元素，我仍然需要保留元素列表保持有序。我仍然是正则表达式的新手 - 有没有办法做到这一点我还没有找到？

Answer 1

试试这个：

   goalList = ['' for x in range(len(bigList)]
   for elem in bigList:
       if sequenceA in bigList[elem]:
           goalList[elem] = sequenceA
       if sequenceB in bigList[elem]:
           goalList[elem] = sequenceB
       if sequenceA in bigList[elem]:
           goalList[elem] = sequenceC

当然，让它适应您在数据库中拥有的东西。

Answer 2

你可以用一个简单的双循环来做到这一点：

sequences = ['sequenceA', 'sequenceB', 'sequenceC']
bigList = ['Garbage sequenceB blahblah', 'sequenceA nonsense', 'silliness sequenceC', 'total nonsense']

goalList = []
for element in bigList:
    for seq in sequences:
        if seq in element:
            break
    goalList.append(seq if seq in element else "")

print(goalList)
# prints: ['sequenceB', 'sequenceA', 'sequenceC', '']

Answer 3

如果你喜欢神奇的单行。

>>>[ ''.join([x if x in y else '' for x in sequences]) for y in bigList]

['sequenceB', 'sequenceA', 'sequenceC', '']

删除所有但特定的字符串序列

3 个答案: