如何使用 Python 基于一个文件对一组文件的内容进行排序

Question

I'm stuck in a problem regarding strings order inside 3 text files. Here below and example:

file_A.txt

ID    value
AAA   1
BBB   2
CCC   3

file_B.txt

ID    value
BBB   2
AAA   1
CCC   3

file_C.txt

ID    value
CCC   3
AAA   1
BBB   2

As you can see, all the 3 files contain strings and these strings are the same for each file but in different order. I'd like to use the fileA.txt strings order as footprint for the other files in order to modify fileB.txt and fileC.txt like this:

file_A.txt

ID    value
AAA   1
BBB   2
CCC   3

file_B.txt

ID    value
AAA   1
BBB   2
CCC   3

file_C.txt

ID    value
AAA   1
BBB   2
CCC   3

Thanks for tips and help.

Answer 1

Given these files:

$ head *.txt
==> file_a.txt <==
ID    value
AAA   1
CCC   3
BBB   2

==> file_b.txt <==
ID    value
BBB   2
AAA   1
CCC   3

==> file_c.txt <==
ID    value
CCC   3
AAA   1
BBB   2

You could do something like this:

from pathlib import Path 

p=Path(path_to_files)
id_file=Path('path_to_files/file_a.txt')

# create an index from file_a:
with open(id_file) as f:
    next(f)
    idx={line.split()[0]:i for i, line in enumerate(f)}

# for the other files, use that index to sort
for fn in p.glob('file_[bc].txt'):  # glob could be 'file_[!a].txt' too
    with open(fn, 'r+') as f:
        dat=f.readlines()
        f.seek(0)
        for line in [dat[0]]+sorted(dat[1:], 
                             key=lambda l: idx.get(l.split()[0],0)):
            f.write(line)

Result:

$ head *.txt
==> file_a.txt <==
ID    value
AAA   1
CCC   3
BBB   2

==> file_b.txt <==
ID    value
AAA   1
CCC   3
BBB   2

==> file_c.txt <==
ID    value
AAA   1
CCC   3
BBB   2