[Python] Gtk.MessageDialog inherited class throws PyGTKDeprecationWarning warnings

I use a custom class for several projects that inherits Gtk.MessageDialog. Just out of curiosity I ran the script with -Wd:

python3 -Wd dialogs_test.py


Using "parent=" in __init__ I get the following warnings:

.../dialogs_test.py:15: PyGTKDeprecationWarning: Using positional arguments with the GObject constructor has been deprecated. Please specify keyword(s) for "parent" or use a class specific constructor. See: https://wiki.gnome.org/PyGObject/InitializerDeprecations
super().__init__(self,

/usr/lib/python3/dist-packages/gi/overrides/Gtk.py:577: PyGTKDeprecationWarning: The keyword(s) "parent" have been deprecated in favor of "transient_for" respectively. See: https://wiki.gnome.org/PyGObject/InitializerDeprecations


Replace "parent=" with "transient_for=" in __init__:

See above
...
TypeError: could not convert value for property `transient_for' from Dialog to GtkWindow


I use keywords in __init__. So, what am I missing with the first warning?

I cannot find how to use transient_for or if I even have to. Does anybody know where to find the documentation on that?

This is my simplified script:

#!/usr/bin/env python3

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk


class Dialog(Gtk.MessageDialog):
def __init__(self, message_type, buttons, title, text):

# Search for parent
parent = next((w for w in Gtk.Window.list_toplevels() if w.get_title()), None)

# Initialize the dialog object
super().__init__(self,
parent=parent,
message_type=message_type,
buttons=buttons,
text=text)

# Set title
self.set_title(title)

def show_dialog(self):
""" Show the dialog """
response = self.run() in (Gtk.ResponseType.YES,
Gtk.ResponseType.APPLY,
Gtk.ResponseType.OK,
Gtk.ResponseType.ACCEPT)
self.destroy()
return response

def message_dialog(*args, **kwargs):
""" Show message dialog """
#return kwargs
return Dialog(Gtk.MessageType.INFO, Gtk.ButtonsType.OK, *args, **kwargs).show_dialog()


class MessageDialogWindow(Gtk.Window):

def __init__(self):
super().__init__(title="MessageDialog Test")
self.set_default_size(500, 100)
box = Gtk.Box()
self.add(box)

button = Gtk.Button.new_with_label("Info dialog by class")
button.connect("clicked", self.on_info_clicked)
button.set_hexpand(True)
box.add(button)

def on_info_clicked(self, widget):
result = message_dialog(title='button title', text='button text')
print((f"button result: {result}"))


win = MessageDialogWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()


[SOLUTION]

The solution is to leave out "self" and replace "parent=" with "transient_for=" in __init__:

super().__init__(transient_for=parent,
message_type=message_type,
buttons=buttons,
text=text)

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