Introduction to how to use python to replace file names and file contents in a folder

Example effect:

1. Replace the name of the folder and subfolder under a folder from OldStrDir to NewStrDir;

2. Replace The names of all files in folders and subfolders under a certain folder change from OldStrFile to NewStrFile;

3. Replace the contents of all files in folders and subfolders under a certain folder by OldStrContent becomes NewStrContent;

Corresponding code:

# -*- coding: UTF-8 -*-

import os
import re

#replace dir name
def replaceDirName(rootDir,oldStr,newStr):
    for parent,dirNames,fileNames in os.walk(rootDir,topdown=False):
        for dirName in dirNames:
            if oldStr in dirName:
                dirNameOld = os.path.join(parent,dirName)
                dirNameNew = os.path.join(parent,dirName.replace(oldStr,newStr))
                print(dirNameOld  + ' --> ' +  dirNameNew)
                os.rename(dirNameOld,dirNameNew)
            
            
#replace file name
def replaceFileName(rootDir,oldStr,newStr):
    for parent,dirNames,fileNames in os.walk(rootDir):
        for fileName in fileNames:
            if oldStr in fileName:
                fileNameOld = os.path.join(parent,fileName)
                fileNameNew =  os.path.join(parent,fileName.replace(oldStr,newStr))
                print(fileNameOld  + ' --> ' +  fileNameNew)
                os.rename(fileNameOld,fileNameNew)
            
#replace file content name
def replaceFileContent(rootDir,oldStr,newStr):
    for parent,dirNames,fileNames in os.walk(rootDir):
        for fileName in fileNames:
            fileObj = os.path.join(parent,fileName)
            f = open(fileObj,'r+')
            all_the_lines=f.readlines()
            f.seek(0)
            f.truncate()
            for line in all_the_lines:
                f.write(line.replace(oldStr,newStr))    
            f.close()  


def main():
    rootDir = "D:/D"
    oldStr = "CustomerType"
    newStr = "CustomerAttr"

    replaceDirName(rootDir,oldStr,newStr)
    replaceFileName(rootDir,oldStr,newStr)
    replaceFileContent(rootDir,oldStr,newStr)

if __name__=='__main__':
    main()

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