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PyQt4 QCompleter ordering

So I'm trying to create a search widget for an external app. I am 90% the way there but there is one slight hurdle and that's the order that the list is displayed.

<pre class='prettyprint lang-py'>from PyQt4 import QtGui, QtCore


class TabWidget(QtGui.QMainWindow):

    def __init__(self):
        super(TabWidget, self).__init__()

        self.input = QtGui.QLineEdit()

        self.custom_auto_completer = CustomCompleter()
        self.custom_auto_completer.setCompletionMode(QtGui.QCompleter.PopupCompletion)
        self.custom_auto_completer.setCaseSensitivity(0)
        self.input.setCompleter(self.custom_auto_completer)

        new_list = ['apple', 'carrot', 'commendable', 'appendable', 'happen', 'dab']

        model = QtGui.QStringListModel(new_list)
        self.custom_auto_completer.setModel(model)

        self.setWindowFlags(QtCore.Qt.FramelessWindowHint | QtCore.Qt.Popup)
        self.setCentralWidget(self.input)
        self.resize(200, 20)
        self.setStyleSheet("margin:5px; border:5px solid rgb(10, 10, 10); border-radius:10px")
        self.input.setFocus()

        self.comp = None

        self.show()

    def showEvent(self, event):
        position = self.frameGeometry()
        position.moveCenter(QtGui.QCursor.pos())
        self.setGeometry(position)
        super(TabWidget, self).showEvent(event)


class CustomCompleter(QtGui.QCompleter):

    def __init__(self):
        super(CustomCompleter, self).__init__()
        self.local_completion_prefix = ""
        self.source_model = None
        self.filterProxyModel = QtGui.QSortFilterProxyModel(self)
        self.usingOriginalModel = False

    def setModel(self, model):
        self.source_model = model
        self.filterProxyModel = QtGui.QSortFilterProxyModel(self)
        self.filterProxyModel.setSourceModel(self.source_model)
        super(CustomCompleter, self).setModel(self.filterProxyModel)
        self.usingOriginalModel = True

    def updateModel(self):
        if not self.usingOriginalModel:
            self.filterProxyModel.setSourceModel(self.source_model)

        pattern = QtCore.QRegExp(self.local_completion_prefix, QtCore.Qt.CaseInsensitive, QtCore.QRegExp.FixedString)

        self.filterProxyModel.setFilterRegExp(pattern)

    def splitPath(self, path):
        self.local_completion_prefix = path
        self.updateModel()

        if self.filterProxyModel.rowCount() == 0:
            self.usingOriginalModel = False
            self.filterProxyModel.setSourceModel(QtGui.QStringListModel([path]))
            return [path]
        else:
            return QtCore.QStringList()


tab_search = 0


def main():
    global tab_search
    tab_search = TabWidget()
    tab_search.show()
    return tab_search

if __name__ == '__main__':
    app = QtGui.QApplication([])
    main()
    app.exec_()
</pre>

So at the moment if I search for the word 'dab' the words commendable and appendable will show up before dab but I would like dab to show up first. I'm very new to pyqt and I have found a couple of examples that apparently work in qt but they are written in C++ and I'm not very good at translating that into python code.

Any help would be super appreciated.

Thanks!