python - 在Python中将2个文本文件合并为一个具有2列的文本文件

Question

我有 2 个文本文件，每个文件都有相同的行数，我想将这 2 个文本文件合并到一个 csv 文件中，分成 2 个字段，并带有一个附加行号字段。这在 python 中可能吗？

File1:
This is a source first line 
This is a source second line
This is a source third line 

File2:
This is a transformed line 1
This is a transformed line 2
This is a transformed line 3 

Outputfile:
1,This is a source first line    ,This is a transformed line 1
2,This is a source second line   ,This is a transformed line 2
3,This is a source third  line   ,This is a transformed line 3

Answer 1

给定:

$ cat file1
This is a source first line 
This is a source second line
This is a source third line 
$ cat file2
This is a transformed line 1
This is a transformed line 2
This is a transformed line 3 

你可以这样做:

from itertools import izip_longest

with open(fn1) as f1, open(fn2) as f2:
    print '\n'.join(['{}: {}\t{}'.format(i,l1.strip(),l2.strip()) for i,(l1,l2) in enumerate(izip_longest(f1,f2),1)])

打印:

1: This is a source first line  This is a transformed line 1
2: This is a source second line This is a transformed line 2
3: This is a source third line  This is a transformed line 3

现在假设您有:

$ cat file1
This is a source first line 
This is a source second line
This is a source third line 
$ cat file2
This is a transformed line 1
This is a transformed line 2
This is a transformed line 3 
This is line 4

您需要使输出为真列(通过使用 {:40} 设置 40 个字符的列值)，并使用 fillvalue 作为 izip_longest:

with open(fn1) as f1, open(fn2) as f2:
    print '\n'.join(['{}: {:40}{:40}'.format(i,l1.strip(),l2.strip()) for i,(l1,l2) in enumerate(izip_longest(f1,f2,fillvalue=""),1)])

打印:

1: This is a source first line             This is a transformed line 1            
2: This is a source second line            This is a transformed line 2            
3: This is a source third line             This is a transformed line 3            
4:                                         This is line 4