QSqlQuery in PyQt4

[wirasto]

What different QSqlQuery in Qt and PyQt ?

query=QSqlQuery()
query.prepare("select id, nama, id_group, groups from pemakai where nick=:a and groups=:b")
query.bindValue(":a", self._username)
query.bindValue(":b", self._grp)
if query.exec_():
	print "OK"
else:
	print query.lastError().text()

query=QSqlQuery()
query.prepare("select id, nama, id_group, groups from pemakai where nick=:a and groups=:b")
query.bindValue(":a", self._username)
query.bindValue(":b", self._grp)
if query.exec_():
	print "OK"
else:
	print query.lastError().text()

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Result:

ERROR: wrong number of parameters for prepared statement "qpsqlpstmt_1"
DETAIL: Expected 2 parameters but got 0.
QPSQL: Unable to create query