Model Exercise Solution

The model should now contain the following top level function:

from typing import List

def line_colours(self) -> List[str]:
    colour_table = ["red", "blue", "black"]
    return colour_table

The view should contain the following method:

def set_colours(self, options: List[str]) -> None:
    self._colours.clear()
    self._colours.addItems(options)

The presenter initialisation should now be:

def __init__(self, view, model):
   self._view = view
   self._model = model

   self._view.subscribe_presenter(self)

   self._view.set_colours(self._model.line_colours())

And the Main module should now pass the two models into the presenter:

import sys

from qtpy.QtWidgets import QApplication

from model import PlotModel
from view import View
from presenter import Presenter


def _get_qapplication_instance() -> QApplication:
    if app := QApplication.instance():
        return app
    return QApplication(sys.argv)


if __name__ == "__main__" :
    app = _get_qapplication_instance()
    model = PlotModel()
    view = View()
    presenter = Presenter(view, model)
    view.show()
    app.exec_()