Python

Question

Python 2.7

我有多个文件：

文件A_01.txt文件内容：aaaa

文件A_02.txt文件内容：bbbb

文件B_01.txt文件内容：aaaB

文件B_02.txt文件内容：bbbB

文件D_01.txt文件内容内容：aaaD

文件D_02.txt文件内容内容：bbbD

我需要根据文件前缀创建 "merged" 文件，

对于以 A_0 开头的文件，创建合并文件 merged_A.txt 并将所有以 A_0、

开头的文件的内容放在那里

merged_B.txt 对于以 B_

开头的文件

所有文件都一样

# get all files in folder 

files = os.listdir("C:\MTA\mta") 

for filename in files:
    #get prefix
   prefix = filename[0:3]

# open destination file to merge individual files into 

   with open(os.path.join("C:\MTA\mta", "merged" + "_" + prefix + ".txt"), 'w') as outfile:
       # go through all files and merge it into outfile
       for file in files:
           with open(os.path.join("C:\MTA\mta", filename)) as infile:
             outfile.write(infile.read())
           outfile.write("--------------\n")

以上代码，生成合并文件，但是，两个合并文件都包含所有文件的内容

files = os.listdir("C:\MTA\mta") 

for filename in files:
    #get prefix
   prefix = filename[0:3]

# open destination file to merge individual files into 

   with open(os.path.join("C:\MTA\mta", prefix + "file.siem"), 'w') as outfile:
       # go through all files and merge it into outfile
       #for filename in files:
           with open(os.path.join("C:\MTA\mta", filename)) as infile:
             outfile.write(infile.read())
           outfile.write("--------------\n")

此版本只将一个文件的内容写入合并文件

Answer 1

您每次读取文件时都在写入一个新文件，您需要改为追加。您还有一个不必要的嵌套 for 循环来读取文件，而您可以在外循环中读取它们。这应该有效：

import os

# get all files in folder 

files = os.listdir("C:\MTA\mta") 

for filename in files:
    #get prefix
    prefix = filename[0:2]


# open destination file to merge individual files into 

    with open(os.path.join("C:\MTA\mta", "merged" + "_" + prefix + ".txt"), 'a') as outfile:
       # go through all files and merge it into outfile
        with open(os.path.join("C:\MTA\mta", filename)) as infile:
            outfile.write(infile.read())
        outfile.write("--------------\n")

Python - 根据文件前缀合并多个文件

Python - merge multiple files based on file prefix

join

concat