#!/usr/bin/python
# -*- coding: utf-8 -*-
import psycopg2, sys, psycopg2.extras, time

order = 4419

try:
    con = psycopg2.connect(host='localhost', database='Divina_DB01', user='odoo', password='ik0kil')
    cur = con.cursor()
    po_lines = '''SELECT pos_order_line.id, pos_order_line.order_id, product_template.name, pos_order_line.qty, product_template.pos_categ_id
               FROM public.pos_order_line, public.product_template
               WHERE pos_order_line.product_id = product_template.id AND  pos_order_line.order_id = %s
               AND (product_template.pos_categ_id != 5 AND product_template.pos_categ_id != 6)
               ORDER BY pos_order_line.id ASC'''

    cur.execute(po_lines,[order]); fetch_lines = cur.fetchall()
    instr = ''
    newTable = []
    for i, line in enumerate(fetch_lines):
        print line
        if line[2].startswith('#') or line[2].startswith('----'):
            if line[2].startswith('#'):
                #instr.insert(1," Cortar em dois")
                instr = instr + " Cortar em dois"
                print instr
            if line[2].startswith('----'):
                #instr.insert(0, "!SERVIR DEPOIS!")
                instr = '!SERVIR DEPOIS!' + instr
                print instr
        elif i == len(fetch_lines):
            newTable.append([line[0], line[1], line[2], line[3], instr])
        elif i < len(fetch_lines):
            newTable.append([line[0], line[1], line[2], line[3], ''])
    print newTable

except psycopg2.DatabaseError, e:
    print 'Error %s' % e
    sys.exit(1)

finally:
    if con:
        con.close()

--------------------
Result:

/usr/bin/python2.7 /home/effe/PycharmProjects/Odoo_DB_Access/new_divina_pos_test2.py
(12811, 4419, 'Crudo GR', Decimal('1.0'), 1)
(12812, 4419, 'Salame e Grana GR', Decimal('1.0'), 1)
(12813, 4419, '---- servir depois ----', Decimal('1.0'), 7)
!SERVIR DEPOIS!
(12814, 4419, 'Nutella Ban GR', Decimal('1.0'), 3)
(12815, 4419, '# Cortar em dois', Decimal('1.0'), 7)
!SERVIR DEPOIS! Cortar em dois
[[12811, 4419, 'Crudo GR', Decimal('1.0'), ''], [12812, 4419, 'Salame e Grana GR', Decimal('1.0'), ''], [12814, 4419, 'Nutella Ban GR', Decimal('1.0'), '']]

Process finished with exit code 0