Пример парсинга с помощью lxml и psycopg2 для Postgres

Yandex market Postgres Parsing

#!/usr/local/bin/python
# coding: utf8

import urllib as url
from lxml import etree
import psycopg2
import datetime

print ("Обработка файла = %s" % datetime.datetime.now())

tree = etree.parse('-1.xml')
offers = tree.xpath('/yml_catalog/shop/offers/offer')

print ("Импорт в БД = %s" % datetime.datetime.now())

connect = psycopg2.connect(database='DBNAME', user='DBUSER', host='DBHOST', password='DBPASS')
cursor = connect.cursor()

for offer in offers:
        name = offer.find('name').text
        #available = offer.get('available') #attr
        id = offer.get('id')
        #print id, name
        cursor.execute('INSERT INTO table (name, pid) VALUES (%s, %s)', (name, id))

connect.commit()
connect.close()

print ("Завершение импорта = %s" % datetime.datetime.now())