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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 the string representing this UDF Logical Volume
        Implementation Use.

        Parameters:
         None.
        Returns:
         A string representing this UDF Logical Volume Implementation Use.
        '''
        if not self._initialized:
            raise pycdlibexception.PyCdlibInternalError('UDF Logical Volume Implementation Use not initialized')

        return struct.pack(self.FMT, self.impl_id.record(),
                           self.num_files, self.num_dirs,
                           self.min_udf_read_revision,
                           self.min_udf_write_revision,
                           self.max_udf_write_revision) + self.impl_use