new_contents: #!/usr/bin/env python3
  # -*- coding: utf-8 -*-
  __author__ = 'xilei'
  
  import os
  from os.path import join
  import stat
  
  
  def chmod(targetdir):
      """
       chmod 644 for files
      """
      for root, dirs, files in os.walk(targetdir):
          for file in files:
              prefix,ext = os.path.splitext(file)
              if ext == '.pyc':
                  filename = join(root,file)
                  os.remove(filename)
                  print("remove:%s" % filename)
  
  
  if __name__ == '__main__':
      ##print(os.mkdir('/home/xilei/work/test/dirs'), 755)
      chmod('./')
  
subject: Add cleanpyc script