def keyPressEvent(self, evt): if evt.key() in (Qt.Key_Up, Qt.Key_Down): # show completer on arrow key up/down if not self.completer.popup().isVisible(): self.showCompleter() return if (evt.key() == Qt.Key_Tab and evt.modifiers() & Qt.ControlModifier): # select next completion if not self.completer.popup().isVisible(): self.showCompleter() index = self.completer.currentIndex() self.completer.popup().setCurrentIndex(index) cur_row = index.row() if not self.completer.setCurrentRow(cur_row + 1): self.completer.setCurrentRow(0) return if evt.key() in (Qt.Key_Enter, Qt.Key_Return): # apply first completion if no suggestion selected selected_row = self.completer.popup().currentIndex().row() if selected_row == -1: self.completer.setCurrentRow(0) index = self.completer.currentIndex() self.completer.popup().setCurrentIndex(index) self.hideCompleter() QWidget.keyPressEvent(self, evt) return QLineEdit.keyPressEvent(self, evt) if not evt.text(): # if it's a modifier, don't show return if evt.key() not in ( Qt.Key_Enter, Qt.Key_Return, Qt.Key_Escape, Qt.Key_Space, Qt.Key_Tab, Qt.Key_Backspace, Qt.Key_Delete): self.showCompleter()