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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 File Entry.

        Parameters:
         None.
        Returns:
         A string representing this UDF File Entry.
        '''
        if not self._initialized:
            raise pycdlibexception.PyCdlibInternalError('UDF File Entry not initialized')

        rec = struct.pack(self.FMT, b'\x00' * 16,
                          self.icb_tag.record(), self.uid, self.gid,
                          self.perms, self.file_link_count, 0, 0, 0,
                          self.info_len, self.log_block_recorded,
                          self.access_time.record(), self.mod_time.record(),
                          self.attr_time.record(), 1,
                          self.extended_attr_icb.record(),
                          self.impl_ident.record(), self.unique_id,
                          self.len_extended_attrs, len(self.alloc_descs) * 8)[16:]
        rec += self.extended_attrs
        for length, pos in self.alloc_descs:
            rec += struct.pack('=LL', length, pos)

        return self.desc_tag.record(rec) + rec