Qt for Python (PySide/Shiboken)

this is my code: def CreateTab(self): uname = self.UnamelineEdit.text() email = self.MaillineEdit.text() pword = self.PwordlineEdit.text() con = sqlite3.connect("databasename") con.execute("INSERT INTO USER(USERNAME,EMAIL,PASSWORD) VALUES(?,?,?)", (uname, email, pword)) if UnameLineEdit.text == "": print("invalid") else: print("data inserted") con.commit() con.close() msg = QMessageBox() msg.setWindowTitle("Confirmation") msg.setText("Registeration successful!") msg.setIcon(QMessageBox.Information) msg.setStandardButtons(QMessageBox.Retry | QMessageBox.Ignore | QMessageBox.Cancel) msg.setDefaultButton(QMessageBox.Ignore) x = msg.exec_()