def seek(offset, whence=0):
    """Set the reader's current position.

        The `offset` is a number of bytes.  The direction and source
        of the measurement is determined by the `whence` argument.

        The `whence` argument is optional and defaults to 0 (absolute
        file positioning); other recognized values are 1 (seek
        relative to the current position) and 2 (seek relative to the
        end).

        There is no return value.

        """
