Yes I Found This Solution this way Because frappe.db.sql is not working on print format but frappe.get_all() , get_value(). its working
{% set qty_in_kgs_total = [0] %}
{% set balance_total=[0] %}
{% set imp_qnty=[0] %}
{%- for row in doc.yarn_description -%}
{% set _ = qty_in_kgs_total.append(qty_in_kgs_total.pop() + row.qnty_in_kgs|int) %}
{% set _ = balance_total.append(balance_total.pop()+row.balance|int ) %}
{% set _ =imp_qnty.append(imp_qnty.pop()+row.imp_qnty|int ) %}
<tr>
<td>{{row.idx}}</td>
<td>{{row.yarn_specification}}</td>
<td>{{row.qnty_in_kgs}}</td>
<td>{% if row.imp_qnty %} {{row.imp_qnty}} {% endif %}</td>
<td>{% if row.b2b_lc_no %} {{row.b2b_lc_no}} {% endif %}</td>
<td>{% if row.mills %} {{row.mills}} {% endif %}</td>
<td>{{row.balance}}</td>
<td>{% if row.remarks %} {{row.remarks}} {% endif %}</td>
</tr>
{%- endfor -%}
<tr>
<td></td>
<td>Total :-</td>
<td>{{ qty_in_kgs_total[0] }}</td>
<td>{{ imp_qnty[0] }}</td>
<td></td>
<td></td>
<td>{{balance_total[0]}}</td>
<td></td>
</tr>
</tbody>
</table>
| Sl No | Yarn Description | Qnty in Kgs. | Imp Qnty. | B2B L/C no | Mills | Balance | Remark |