I have an application that has a combo box with many entries. I want the user to select an entry and want to help them with a completer to narrow down selection as he types in the text. Works great as long as only one word is entered.
I wanted to change the filtering to token filtering so that the entered text "apple red" would also match the "best apples are red apples" but I couldn't get it to do that because as soon as I enter the space sharacter this item is removed.
 
Here is how I use the completer on my combo box:
 

combo.completer = QtWidgets.QCompleter(arrayOfItems, parent)
combo.completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive)
combo.completer.setModelSorting(QtWidgets.QCompleter.CaseInsensitivelySortedModel)
combo.completer.setCompletionMode(QtWidgets.QCompleter.PopupCompletion)
combo.completer.setMaxVisibleItems(20)
combo.setCompleter(self.completer)
  

Best regards.