Pyside2 signal slots 2d array signature definition, equivalent for list of list

Question

I am trying to connect a signal that emits a 2D array to a slot that processes that list of list.

I am using @Slot(list) in my slot definition and SIGNAL("slot_method(QList<QList<QString>>)") but that doesn't seem to work.

I would like to know what is proper conversion of a list of lists in Qt terms.

Answer 1

In Python there are no 2D lists, there are only lists so you must use the signature list.

Example:

from PySide2 import QtCore


class Sender(QtCore.QObject):
    signal = QtCore.Signal(list)

    def on_test(self):
        l = [["a", "b", "c", "d"], ["A", "B", "C", "D"]]
        self.signal.emit(l)


class Receiver(QtCore.QObject):
    @QtCore.Slot(list)
    def on_receiver(self, l):
        print(l)
        QtCore.QCoreApplication.quit()


if __name__ == '__main__':
    import sys
    app = QtCore.QCoreApplication(sys.argv)

    sender = Sender()
    receiver = Receiver()
    sender.signal.connect(receiver.on_receiver)
    QtCore.QTimer.singleShot(1000, sender.on_test)

    sys.exit(app.exec_())