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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 sector_select(self, sector):
 """Send a SECTOR_SELECT command to switch the 1K address sector. The command is only send to the tag if the *sector* number is different from the currently selected sector number (set to 0 when the tag instance is created). If the command was successful, the currently selected sector number is updated and further :meth:`read` and :meth:`write` commands will be relative to that sector. Command execution errors raise :exc:`Type2TagCommandError`. """

        if sector != self._current_sector:
            log.debug("select sector {0} (pages {1} to {2})".format(
                sector, sector << 10, ((sector+1) << 8) - 1))

            sector_select_1 = b'\xC2\xFF'
            sector_select_2 = pack('Bxxx', sector)

            rsp = self.transceive(sector_select_1)
            if len(rsp) == 1 and rsp[0] == 0x0A:
                try:
                    # command is passively ack'd, i.e. there's no response
                    # and we must make sure there's no retries attempted
                    self.transceive(sector_select_2, timeout=0.001, retries=0)
                except Type2TagCommandError as error:
                    assert int(error) == TIMEOUT_ERROR  # passive ack
                else:
                    log.debug("sector {0} does not exist".format(sector))
                    raise Type2TagCommandError(INVALID_SECTOR_ERROR)
            else:
                log.debug("sector select is not supported for this tag")
                raise Type2TagCommandError(INVALID_SECTOR_ERROR)

            log.debug("sector {0} is now selected".format(sector))
            self._current_sector = sector
        return self._current_sector