PySide Error emitting dataChanged signal in QAbstractItemModel subclass

Question

I'm getting this error when trying to emit dataChanged signal:

self.dataChanged.emit(index, index)
TypeError: Value types used on meta functions (including signals) need to be registered on meta type: QModelIndex

Here is the relevant part of my QAbstractItemModel subclass:

class PropertyItemModel(QtCore.QAbstractItemModel):
    def __init__(self, parent=None):
        super(PropertyItemModel, self).__init__(parent)

    def setData(self, index, value, role=Qt.EditRole):
        if role != Qt.EditRole:
            return False

        item = self.getItem(index)
        result = item.setData(index.column(), value)

        if result:
            self.dataChanged.emit(index, index)

            # Doesn't work either (same error):
            # self.emit(QtCore.SIGNAL("dataChanged(QModelIndex, QModelIndex)"), index, index)
            # QtCore.QObject.emit(self, QtCore.SIGNAL("dataChanged(const QModelIndex&, const QModelIndex&)"), index, index)

        return result

I'm using PySide version 1.2.1 with Qt 4.8.5 on Mac OS X (10.10). The error can be related with my specific environment. This code was working on another mac.

Answer 1

Indeed, this was caused by installation conflicts. I've had different flavours of python (system, brew, package from official site).

Fresh install using homebrew fixed the problem.