Question

我正在使用python 3.6.1。我有一个目录，里面有成千上万的文本文件。

我想删除每个文本文件中的前两行，而不是为每个文本文件创建一个新副本。

此外，我想删除每个文件中的最后一行，如果它们包含某个＆＃34;关键字＆＃34;，如果没有，那么最后一行不会被移除并且仍在那里。

怎么做？

提前致谢。

Answer 1

试试这个（我假设文本文件至少有3行）：

import glob

path = r"./"                                #Type your PATH here or run the script in your files' directory                 
filenames = glob.glob(path + "*.txt")          
keyword = "keyword"

for file in filenames:
    with open(file) as f:
        lines = f.readlines()
    lines = lines[2:]                       #Delete first and second line
    if keyword in lines[len(lines) - 1]:
        lines = lines[:-1]                  #Delete last line if necessary
    with open(file, "w") as f:
        for line in lines:
            f.write(line)

Answer 2

我认为使用os库可以。


    import os
    import re

    path = r"<directory>"

    #now you could print everything inside the directory
    print(os.listdir(path))

    #to print each item separately
    for roots, dirs, files in os.walk(path):
        #the roots will select all the roots, dirs will select the directories 
        #inside your directory and files will select only the files inside 
        #your directory

        #to get the files
        for file in files:
            #you can print all filenames for test purpose
            print("File = %s", file)

            #now you have the string names of all files, all that is left to do 
            #is parse them using regular expressions.

            parts = re.split("\.",file)
            #this will spit the string after the period 
            #the parts variable will now have two parts, first part containing 
            #the file name and the second part containing the file extension.

            if(parts[1]=="txt"):
                f = open(file,"w")
                #now you can do whatever you want with the file

希望这对你有用

Answer 3

您只需使用python os module并对目录中的每个文本文件执行操作：

import os

path = "Your directory path"
for file in os.listdir(path):
        if file.endswith(".txt"):
                lines = open(file).readlines()
                open(file, 'w').writelines(lines[2:])
                if keyword in lines:
                        open(file, 'w').writelines(lines[:-1])

使用Python在目录中操作许多文本文件

3 个答案: