将输入的目录，修改其中的视频文件名与目录同名，文件类型不变；同类重命名时后缀2位序列号加以区分

import os

def rename(oldName, newName):
  os.rename(oldName, newName)

def renameDirectory(path, fileName):
  for root, dirs, files in os.walk(path):
    for file in files:
      if file != fileName and file.split('.')[-1] == 'mp4':
        rename(os.path.join(root, file), os.path.join(root, fileName + '.mp4'))
    break
  
renameDirectory('/Users/alan/Downloads/video/react-native', 'react-native')