def open(self, directory=None, filename=None, mode="rb"):
        """Opens a file for writing or reading."""
        path = os.path.join(directory, filename)
        return open(path, mode)
def open ( self , directory = None , filename = None , mode = "rb" ) : path = os . path . join ( directory , filename ) return open ( path , mode )
Opens a file for writing or reading.