python如何导入文件夹中的多个.txt文件以向每个.txt文件添加字符？

Question

“a”文件夹中有不同名称的文本文件。我想阅读所有这些文本文件，并在每个文本文件中添加字母“b”。我该怎么办？在

cwd = os.getcwd()
input_dir = os.path.join(cwd, "my .txt files dir")

sorts = sorted(glob(input_dir), key = lambda x:(len(x) , x))

for f in sorts :
    f = open(input_dir, 'a')
    data = "add text"
    f.write(data)
    f.close()

Answer 1

将数据追加到文件：
-首先：获取文件夹a中的所有文件
-第二：用.txt查找扩展名
-第三：打开它并做一些事情（'append'或'rewrite'）。在

演示：

import os

# your .txt files dir
path = 'a'
# append data what you want
appendData = 'b'

fileNames = list(os.walk(path))[0][2]
fileNames.sort(key=len)
fileNums = len(fileNames)

# your dst file extension
fileExt = '.txt'
# # Extract extension from filename
# fileExt = os.path.splitext(fileNames[0])[1]

for fileName in fileNames:
    if fileName.endswith(fileExt):
        fileFullPath = os.path.join(path, fileName)
        with open(fileFullPath, 'a') as f:
            f.write(appendData)

Answer 2

避免用打开文件

f = open(input_dir, 'a')
f.close()

取而代之的是

^{pr2}$

你想要的也是

import os
import glob  # We will use this module to open only .txt files

path = 'your/path'

for filename in glob.glob(os.path.join(path, '*.txt'))
    with open(filename, 'a') as inputFile:
        inputFile.write('b')

Answer 3

正如其他人所说，这是一个很容易在谷歌上找到的问题。总之，下面是如何做到的：

from os import listdir
from os.path import isfile, isdir, join

files = [file for file in listdir("files") if isfile(join("files", file))]
        directories = [directory for directory in listdir("files") if isdir(join("files", directory))]

print(files)

for file_name in files:
    try:
        file = open("files/" + file_name, "a")
        file.write("b")
        file.close()
    except IOError as err:
        print("Could not open file because : ", err)

将“file”替换为文件所在的目录或该目录的路径，如“directory0/directory1/directory_with_files”