import psycopg2
from osmapi import OsmApi
username=u''
password=u''
api = OsmApi(username=username, password=password,
             changesetauto=True, changesetautotags={"comment": u"Remove addr:country_code"})
pg_dsn='user=, password=, host= ,database='
con = psycopg2.connect(pg_dsn)
cur = con.cursor()
cur.execute("select osm_id,name from planet_osm_polygon where admin_level='9' and boundary='administrative'")
data = cur.fetchall()

for poble in data:
    identificador = abs(poble[0])
    nom = poble[1]
    rel = api.RelationGet(identificador)
    if 'addr:country_code' in rel['tag']:
        del rel['tag']['addr:country_code']
        api.RelationUpdate(rel)
        api.flush()
        print 'commit: id={} poble={}'.format(identificador, nom)