SO! I am fairly new to Python and I have a large series of files that I need to replace certain lines with other lines.
I know this may be a little confusing, but let me explain.
So I have a directory full of files, let's so temp/.
I need to iterate through all the files in that directory, using Python and modify each file, replacing certain lines.
For this, I want to have one file called newStrings.txt
I hate this string
Please get rid of me
Code has been tailored per the poster's request.
import os folderLocation = "temp/" lookup = dict() with open("newString.txt","r") as values: with open("oldString.txt","r") as keys: keyLines = keys.readlines() valueLines = values.readlines() for i, line in enumerate(keyLines): lookup[line] = valueLines[i] for subdir, dirs, files in os.walk(folderLocation): for fileIn in files: os.rename(folderLocation + fileIn, folderLocation + "old_" + fileIn) with open (folderLocation + "old_" + fileIn, "r") as fi: with open(folderLocation + fileIn, "w") as fo: for line in fi: if line in lookup: fo.write(lookup[line]) else: fo.write(line)