parsing id meteo stations

# -*- coding: utf-8 -*-
from lxml import etree
import urllib
import sqlite3

def url2db(db_name,st_id,st_name):
    ''' INSERT DATA INTO DB '''
    try:
        conn = sqlite3.connect(db_name)
        c = conn.cursor()
        c.execute("INSERT OR FAIL INTO stations VALUES (?,?)", (st_id,st_name))
        print 'a new data added to database!'
        conn.commit()
        conn.close()
    except:
        print "INSERT error!"

web = urllib.urlopen("http://meteocenter.net/_world_weather_stations.htm")
s = web.read()

html = etree.HTML(s)

## Get all 'tr'
tr_nodes = html.xpath('//table/tr')

## 'th' is inside first 'tr'
header = [i[0].text for i in tr_nodes[0].xpath("th")]

## Get text from rest all 'tr'
td_content = [[td.text for td in tr.xpath('td')] for tr in tr_nodes[1:]]

for istation in td_content:
    if (istation[-1]==u"Российская Федерация"):
        print istation[0], istation[1]
        url2db('/home/www-data/db/meteo',istation[0], istation[1])