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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def record(self):
        # type: () -> bytes
        '''
        A method to generate a string representing this boot info table.

        Parameters:
         None.
        Returns:
         A string representing this boot info table.
        '''
        if not self._initialized:
            raise pycdlibexception.PyCdlibInternalError('This Eltorito Boot Info Table not yet initialized')

        return struct.pack('=LLLL', self.vd.extent_location(),
                           self.inode.extent_location(), self.orig_len,
                           self.csum) + b'\x00' * 40