如何 "join" 两个带有 python 的文本文件？

Question

我有两个这样的 txt 文件： txt1:

Foo
Foo
Foo
Foo

txt2:

Bar
Bar
Bar
Bar

如何将它们连接到一个新文件的左侧和右侧让我们这样说：

Bar Foo
Bar Foo
Bar Foo
Bar Foo

我尝试了以下方法：

folder = ['/Users/user/Desktop/merge1.txt', '/Users/user/Desktop/merge2.txt']
with open('/Users/user/Desktop/merged.txt', 'w') as outfile:
    for file in folder:
        with open(file) as newfile:
            for line in newfile:
                outfile.write(line)

Answer 1

您可以使用 zip 压缩这些行然后连接并将它们写入您的输出文件：

folder = ['/Users/user/Desktop/merge1.txt', '/Users/user/Desktop/merge2.txt']
with open('/Users/user/Desktop/merged.txt', 'w') as outfile:
    for file in folder:
        with open(file[0]) as newfile,open(file[1]) as newfile1:
            lines=zip(newfile,newfile1)
            for line in lines:
                outfile.write(line[0].rstrip() + " " + line[1])

Answer 2

使用 itertools.izip 合并两个文件中的行，像这样

from itertools import izip
with open('res.txt', 'w') as res, open('in1.txt') as f1, open('in2.txt') as f2:
    for line1, line2 in izip(f1, f2):
        res.write("{} {}\n".format(line1.rstrip(), line2.rstrip()))

注意：此解决方案将仅写入两个文件中的行，直到其中一个文件耗尽。例如，如果第二个文件包含 1000 行而第一个文件只有 2 行，则每个文件中只有两行被复制到结果中。如果即使在最短文件耗尽后你也想要最长文件中的行，你可以使用 itertools.izip_longest，像这样

from itertools import izip_longest
with open('res.txt', 'w') as res, open('in1.txt') as f1, open('in2.txt') as f2:
    for line1, line2 in izip_longest(f1, f2, fillvalue=""):
        res.write("{} {}\n".format(line1.rstrip(), line2.rstrip()))

在这种情况下，即使较小的文件用完，较长文件中的行仍将被复制，fillvalue 将用于较短文件中的行。

Answer 3

这里有一个脚本可以解决这个问题： https://gist.github.com/fabriciorsf/92c5fb1a7d9f001f777813a79e681d8b

#!/usr/bin/env python

'''
Merge/Join/Combine lines of multiple input files.
Write lines consisting of the sequentially corresponding lines from each input file, separated by whitespace character, to output file.
TODO: implements params like https://github.com/coreutils/coreutils/blob/master/src/paste.c
'''

import sys
from contextlib import ExitStack
from itertools import zip_longest


def main(args):
  if len(args) < 3:
    print(sys.argv[0] + ' <input-file-1> <input-file-2> [<input-file-n>...] <output-file>')
    sys.exit(0)
  mergeFiles(args[:len(args)-1], args[len(args)-1])


def mergeFiles(inputFileNames, outputFileName, delimiterChar=" ", fillValue="-"):
  with ExitStack() as eStack:
    inputFiles = [eStack.enter_context(open(fileName, 'r', encoding='utf-8', errors='replace')) for fileName in inputFileNames]    
    with open(outputFileName, 'w', encoding='utf-8', errors='replace') as outputFile:    
      for tupleOfLineFiles in zip_longest(*inputFiles, fillvalue=fillValue):
        outputFile.write(delimiterChar.join(map(str.strip, tupleOfLineFiles)) + "\n")

if __name__ == "__main__":
  main(sys.argv[1:])

如何 "join" 两个带有 python 的文本文件？

How to "join" two text files with python?

python

file

python-2.7