opkg update
opkg install python-psycopg
nano postgre.py
#!/usr/bin/python
# -*- coding: utf-8 -*-
import psycopg
try:
    conn = psycopg.connect("dbname='mypgdatabase' user='postgres' host='192.168.0.240' password='password'")
except:
    print "I am unable to connect to the database"
cur = conn.cursor()
cur.execute("select username,password from login")
rows = cur.fetchall()
print "\nShow me the databases:\n"
for row in rows:
    print "   ", row[0], "   ", row[1]
chmod 755 postgre.py
./postgre.py