code: def doRollover(self):
          
          # Rotate the file first.
          handlers.RotatingFileHandler.doRollover(self)
  
          # Add group write to the current permissions.
          currMode = os.stat(self.baseFilename).st_mode
          os.chmod(self.baseFilename, currMode | stat.S_IWGRP |
                   stat.S_IRGRP | stat.S_IWOTH | stat.S_IROTH)
docs: *Override base class method to make the new log file group writable.*