PyGObject MessageDialog - PyGTKDeprecationWarning - Not sure what to do

Question

I'm using PyGObject 3.30 and I want to display a simple MessageDialog. This is my source code:

def report_error(self, reason):
    dialog = Gtk.MessageDialog(Gtk.Window(), 0, Gtk.MessageType.INFO, Gtk.ButtonsType.OK, "Something went wrong")
    dialog.format_secondary_text(reason)
    dialog.run()
    dialog.destroy()

It works and the MessageDialog pops up and can be dismissed by clicking on the button. However in my terminal I am getting this error message:

.../main.py:84: PyGTKDeprecationWarning: Using positional arguments with the GObject constructor has been deprecated. Please specify keyword(s) for "parent, flags, message_type, buttons, message_format" or use a class specific constructor. See: https://wiki.gnome.org/PyGObject/InitializerDeprecations
      dialog = Gtk.MessageDialog(Gtk.Window(), 0, Gtk.MessageType.INFO, Gtk.ButtonsType.OK, "Something went wrong")
...main.py:84: PyGTKDeprecationWarning: The keyword(s) "message_format" have been deprecated in favor of "text" respectively. See: https://wiki.gnome.org/PyGObject/InitializerDeprecations
      dialog = Gtk.MessageDialog(Gtk.Window(), 0, Gtk.MessageType.INFO, Gtk.ButtonsType.OK, "Something went wrong")

So what exactly does that mean? I don't know any C. I have no idea what any of this means? I don't even use "message_format" for example. Why is it complaining about it? How can I fix the deprecation error? I'm totally lost here with absolutely no way of knowing what to do. What direction to look at.

I even looked up some PyGObject example source code and the dialog was done in the same way that I have it. The example was using "self" instead of "Gtk.Window()", but "self" just gave me an error, so I used "Gtk.Window()".

Can anybody please give me a more noob-friendly description of what the problem is?

Thanks so much in advance!

Answer 1

The answer it's all in the warning message, it's telling you that using positional argument it's deprecated and that you should "name" each argument

def report_error(self, reason):
    dialog = Gtk.MessageDialog(parent=Gtk.Window(), flags=0, message_type=Gtk.MessageType.INFO, buttons=Gtk.ButtonsType.OK, text="Something went wrong")
    dialog.format_secondary_text(reason)
    dialog.run()
    dialog.destroy()