-2

我想找到以列表中的单词开头的行。如果找到这个词，我希望它所在的行和前一行被删除。我能够得到该行和上一个并打印它们，但我无法将它们传递给我的输出文件。铁：

输入：

This is not supposed to be deleted.
This shall be deleted. 
Titel

This is not supposed to be deleted.
This is not supposed to be deleted

输出：

This is not supposed to be deleted.

This is not supposed to be deleted.
This is not supposed to be deleted

我用这段代码试过了，但我不断收到 TypeError: 'str' object does not support item assignment

with open(file1) as f_in, open(file2, 'w') as f_out:
    lines = f_in.read().splitlines()
    for i, line in enumerate(lines):
        clean = True
        if line.startswith(('Text', 'Titel')):
            for (line[i-1]) in lines:
                clean = False
            for line in lines:
                clean =False
        if clean == True:
            f_out.write(line)
4

2 回答 2

2

您不必一次读取文件。逐行读取行，并存储当前行，但仅在下一次读取后才将其写入，或者不写入。

with open("file1") as finp, open("file2","w") as fout:

         lprev=""
         for line in finp:

             if line.startswith("Titel") or line.startswith("Text"):
                 lprev=""
                 continue
             if lprev:
                 fout.write(lprev)
             lprev=line

         if lprev:
             fout.write(lprev)  # write out the last line if needed
于 2018-11-13T16:19:20.410 回答
1

首先跟踪要复制的行：

lines_to_keep = []
with open(file1) as f_in:
    deleted_previous_line = True
    for line in f_in:
         if line.startswith(('Text', 'Titel')):
              if not deleted_previous_line:
                    del lines_to_keep[-1]
              deleted_previous_line = True
              continue
         deleted_previous_line = False
         lines_to_keep.append(line)

如果连续行以“文本”或“标题”开头，deleted_previous_line则必须确保它不会删除太多行。

然后将其写入您的输出文件

with open(file2, 'w') as f_out:
    f_out.writelines(lines_to_keep)
于 2018-11-13T15:40:37.637 回答