Method _checkSeekable

Lib/_pyio.py:427–432

Internal: raise UnsupportedOperation if file is not seekable

(self, msg=None)

        return False

    def _checkSeekable(self, msg=None):
        """Internal: raise UnsupportedOperation if file is not seekable
        """
        if not self.seekable():
            raise UnsupportedOperation("File or stream is not seekable."
                                       if msg is None else msg)

    def readable(self):
        """Return a bool indicating whether object was opened for reading.