How to bring a variable from the .py file to the .kv file?

Question

Kv language has a way to import names from other files using the following syntax:

#:import name x.y.z

# The same as `from x.y import z as name` in Python code

But it doesn't mention how to import the values from the same module where that kv language is used.
Let's say I have the following code:

from kivy.app import App
from kivy.lang import Builder
from kivy.atlas import Atlas
from kivy.uix.button import Button

theme = Atlas('path/to/atlas')

Builder.load_string('''
<MyWidget>:
    background_normal: theme['widget_bg']
''')

class MyWidget(Button):
    pass

class TestApp(App):
    def build(self):
       return MyWidget() 

TestApp().run()

I'd like to import the theme Atlas object into the kv code to set the proper background. How could this be done?

Answer 1

You can refer to your current module as __main__

#:import theme __main__.theme

<MyWidget>:
   background_normal: theme['widget_bg']