File "kivy/properties.pyx" - KeyError: 'stat_label' ((Its an id I defined))

[Henrik R.]

Hi!

I get this error, immediately when I try to run my app:

```

 Traceback (most recent call last):
   File "kivy/properties.pyx", line 961, in kivy.properties.ObservableDict.__getattr__
 KeyError: 'stat_label'

 
 During handling of the above exception, another exception occurred:

```

'stat_label' is an id on a Label. Those parts of the app worked before, and have only been changed slightly, so I don't understand what is causing this error.

Here is the relevant kv-rule:

```

<StatBox>:
id: stat_box # 'invisible', but not needed...!
MyScrollView:
ScalableLabel:
id: stat_label
markup: True
color: black # Text color
ScalableButton:
id: save_stats_button
on_release: root.button_pressed()

```

This is the Python class, and line 1210, in the class, that gives the second exception (see below):

```

class StatBox(BoxLayout):
...

...

self.ids.stat_label.text = my_data.cur_stats_page_text

```

The second exception:

```

   File "/mnt/4AF15A0435E762B4/mypython/GeoESP/main.py", line 1210, in init_statbox_strings
     self.ids.stat_label.text = my_data.cur_stats_page_text
   File "kivy/properties.pyx", line 964, in kivy.properties.ObservableDict.__getattr__
 AttributeError: 'super' object has no attribute '__getattr__'

```

I find it hard to interpret Python/Kivy error messages. So any help would be quite appreciated. :-)

[Henrik R.]

Sh*t! Is it impossible to include code in an appropriate way on this Google system...?

I will try a screen shot:

[Elliot Garbus]

If you right-click in the Google text box and select paste as plain text, the indentation will be preserved.

 

My guess is that you are trying to access the id, “stat_label” in __init__(), prior to the ids dict being initialized.  You can instead use the Widget method on_kv_post(), rather than __init__().  The method on_kv_post() runs after the kv code for the widget has been processed so the ids are set.

See: https://kivy.org/doc/stable/api-kivy.uix.widget.html?highlight=on_kv_post#kivy.uix.widget.Widget

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[Henrik R.]

Yes, that was it! Thank you!

I have had to use on_kv_post(self, base_widget) before, on your advice, but not in StatBox(BoxLayout), so I was a bit puzzled. :-)