Missing Qt attributes

[mdziczkowski]

Hello. When trying to run the Python version of TS2, I got following output:

NOTE: the location path has been trunchated for privacy reasons

$ ./start-ts2.py 

Traceback (most recent call last):
  File "ts2-py/./start-ts2.py", line 51, in <module>
    import ts2.application
  File "ts2-py/ts2/application.py", line 25, in <module>
    from ts2 import mainwindow
  File "ts2-py/ts2/mainwindow.py", line 36, in <module>
    from ts2 import simulation
  File "ts2-py/ts2/simulation.py", line 29, in <module>
    from ts2 import utils, trains
  File "ts2-py/ts2/trains/__init__.py", line 21, in <module>
    from ts2.trains.traintype import TrainType, TrainTypesModel
  File "ts2-py/ts2/trains/traintype.py", line 26, in <module>
    class TrainTypesModel(QtCore.QAbstractTableModel):
  File "ts2-py/ts2/trains/traintype.py", line 43, in TrainTypesModel
    def data(self, index, role=Qt.DisplayRole):
                               ^^^^^^^^^^^^^^
AttributeError: type object 'Qt' has no attribute 'DisplayRole'