从python中的列表替换文件中的字符串

Question

So I need to find all files with certain extension in this case .txt . Then I must open all these files and change certain string with another string... and here i'm stuck.

here is my code:

import os, os.path

find_files=[]

for root, dirs, files in os.walk("C:\\Users\\Kevin\\Desktop\\python programi"):
for f in files:
    fullpath = os.path.join(root, f)
    if os.path.splitext(fullpath)[1] == '.txt':
        find_files.append(fullpath)
for i in find_files:
    file = open(i,'r+')
    contents = file.write()
    replaced_contents = contents.replace('xy', 'djla')
    print i

ERROR mesage:

line 12, in <module>
    contents = file.write()
TypeError: function takes exactly 1 argument (0 given)

i know that there is misssing an argument but which argument should I use? i think it would be better if i change the code from for i in find files: down any advice?

Answer 1

我认为你的意思是使用file.read()而不是file.write()

Answer 2

Not sure if you're just trying to print out the changes or if you want to actually rewrite them into the file, in which case you could just do this:

for i in find_files:
    replaced_contents = ""
    contents = ""
    with open(i, "r") as file:
        contents = file.read()
        replaced_contents = contents.replace('xy', 'djla')
    with open(i, "w") as file:
        file.write(replaced_contents)
    print i