对文本文件条目进行排序

Question

我正在尝试按每行中的第一个数字对 .txt 文件中的行进行排序。sample text file 我还想将每行中的第二个数字移到每行的末尾。这是我到目前为止的内容，但由于某种原因，这些行没有按两个文件之间的数字排序。

#combine files
filenames = ['detections_mandatory.txt','detections_other.txt']

lines = []
for names in filenames:
    with open(names) as infile:
        for line in infile:
            lines.append(line)

#write list out to new file

with open("detections.txt", "w") as det:

    det.write(''.join(sorted(lines, key=lambda x: int(x.strip()))))

Answer 1

您可以split每一行并根据需要重新排列拆分的单词：

files = ['file1.txt', 'file2.txt']

lines = []
for file in files:
    with open(file, 'r') as f:
        lines.extend(map(lambda line: line.split(), f.readlines())) # store split lines
# lines now is a list of lists

lines.sort(key=lambda line: int(line[0])) # sort the lines

with open('output.txt', 'w') as f:
    for line in lines:
        print(' '.join((line[0], *line[2:], line[1])), file=f)

join 中的双括号不是多余的；可以用join([line[0], ...])代替，但不能省略内部的[]或()。

file1.txt:

5 0.420 0.373 0.009 0.261 0.260
3 0.552 0.190 0.158 0.017 0.786
10 0.706 0.693 0.104 0.878 0.934
8 0.685 0.756 0.915 0.950 0.626

file2.txt:

1 0.916 0.869 0.265 0.634 0.950
3 0.967 0.721 0.734 0.636 0.676
9 0.314 0.267 0.836 0.020 0.868
3 0.739 0.325 0.050 0.071 0.370

output.txt:

1 0.869 0.265 0.634 0.950 0.916
3 0.190 0.158 0.017 0.786 0.552
3 0.721 0.734 0.636 0.676 0.967
3 0.325 0.050 0.071 0.370 0.739
5 0.373 0.009 0.261 0.260 0.420
8 0.756 0.915 0.950 0.626 0.685
9 0.267 0.836 0.020 0.868 0.314
10 0.693 0.104 0.878 0.934 0.706