TypeError: object.__init__() takes no parameters

Reported by TwoCubed on irc.

https://github.com/kivy/kivy/blob/master/examples/widgets/settings.py

 Traceback (most recent call last):
   File "E:\dev\envs\py34_x86\kivy\examples\widgets\settings.py", line 93, in <module>
     SettingsApp().run()
   File "e:\dev\envs\py34_x86\kivy\kivy\app.py", line 825, in run
     runTouchApp()
   File "e:\dev\envs\py34_x86\kivy\kivy\base.py", line 487, in runTouchApp
     EventLoop.window.mainloop()
   File "e:\dev\envs\py34_x86\kivy\kivy\core\window\window_sdl2.py", line 606, in mainloop
     self._mainloop()
   File "e:\dev\envs\py34_x86\kivy\kivy\core\window\window_sdl2.py", line 361, in _mainloop
     EventLoop.idle()
   File "e:\dev\envs\py34_x86\kivy\kivy\base.py", line 330, in idle
     self.dispatch_input()
   File "e:\dev\envs\py34_x86\kivy\kivy\base.py", line 315, in dispatch_input
     post_dispatch_input(*pop(0))
   File "e:\dev\envs\py34_x86\kivy\kivy\base.py", line 221, in post_dispatch_input
     listener.dispatch('on_motion', etype, me)
   File "kivy\_event.pyx", line 717, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7635)
   File "e:\dev\envs\py34_x86\kivy\kivy\core\window\__init__.py", line 986, in on_motion
     self.dispatch('on_touch_down', me)
   File "kivy\_event.pyx", line 717, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7635)
   File "e:\dev\envs\py34_x86\kivy\kivy\core\window\__init__.py", line 1002, in on_touch_down
     if w.dispatch('on_touch_down', touch):
   File "kivy\_event.pyx", line 717, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7635)
   File "e:\dev\envs\py34_x86\kivy\kivy\uix\widget.py", line 438, in on_touch_down
     if child.dispatch('on_touch_down', touch):
   File "kivy\_event.pyx", line 717, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7635)
   File "e:\dev\envs\py34_x86\kivy\kivy\uix\behaviors.py", line 183, in on_touch_down
     self.dispatch('on_press')
   File "kivy\_event.pyx", line 713, in kivy._event.EventDispatcher.dispatch (kivy\_event.c:7590)
   File "kivy\_event.pyx", line 1223, in kivy._event.EventObservers.dispatch (kivy\_event.c:13325)
   File "kivy\_event.pyx", line 1147, in kivy._event.EventObservers._dispatch (kivy\_event.c:12851)
   File "e:\dev\envs\py34_x86\kivy\kivy\app.py", line 913, in open_settings
     self._app_settings = self.create_settings()
   File "e:\dev\envs\py34_x86\kivy\kivy\app.py", line 984, in create_settings
     s.add_kivy_panel()
   File "e:\dev\envs\py34_x86\kivy\kivy\uix\settings.py", line 1004, in add_kivy_panel
     join(kivy_data_dir, 'settings_kivy.json'))
   File "e:\dev\envs\py34_x86\kivy\kivy\uix\settings.py", line 944, in add_json_panel
     panel = self.create_json_panel(title, config, filename, data)
   File "e:\dev\envs\py34_x86\kivy\kivy\uix\settings.py", line 984, in create_json_panel
     instance = cls(panel=panel, **str_settings)
   File "e:\dev\envs\py34_x86\kivy\kivy\uix\label.py", line 248, in __init__
     super(Label, self).__init__(**kwargs)
   File "e:\dev\envs\py34_x86\kivy\kivy\uix\widget.py", line 312, in __init__
     super(Widget, self).__init__(**kwargs)
   File "kivy\_event.pyx", line 253, in kivy._event.EventDispatcher.__init__ (kivy\_event.c:4863)
 TypeError: object.__init__() takes no parameters

[matham]

The problem occurs because we forward up our inheritance chain any kwargs we don’t use. And in python 3, anything that was not eaten by the time we call the highest class, i.e. object will cause a error. I.e. calling super on object must call with empty kwargs.

Now, what does kivy eat in kwargs? Any kwargs key that is a property name will be eaten. That’s because kivy uses it to set the property value, and as per the rules, when it’s used it’s removed from kwargs. So, if you pass something on to super that is not a kivy prop, kivy will forward up the chain and cause an exception when it’s passed to super.

[nikhilraj1321]

Essentially what you are resolving to is the init of the object base class which takes no params.

Its a bit redundant, I know, to have to specify the class that you are already inside of, which is why in python3 you can just do: super().init()