Python-сообщество

from PyQt4 import QtSql
db = QtSql.QSqlDatabase.addDatabase("QPSQL")
db.setHostName("localhost")
db.setDatabaseName("postgres")
db.setUserName("postgres")
db.setPassword("123")
if db.open():
    print "OK";

QSqlDatabase: QPSQL driver not loaded
QSqlDatabase: available drivers: 
QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins