from kivy.app import App
#kivy.require("1.8.0")
from kivy.uix.label import Label
from kivy.uix.widget import Widget


class Widgets(Widget):
    pass
	

class SimpleKivy2(App):
    def build(self):
        return Widgets()
		

if __name__ == "__main__":
    SimpleKivy2().run()
		

We're now importing Widget, and then we're making this Widgets class, which is inheriting from the Widget class from Kivy.

Now, where we used to return a different Kivy class, we're going to instead have SimpleKivy (now called SimpleKivy2, which will correspond to my SimpleKivy2.kv file) now returning the Widgets class.

That's all for the Python code. We pass with the Widgets class because the only "code" that we want for now is just presentation code. Since we're currently using .kv files for the presentation, that's where the rest of our code will be going.

<Widgets>:
	Button:
		size: 100,75
		pos: 0,0
		text: "Kivy"
		color: 0,1,0,1
		font_size: 40

	Button:
		size: 170,75
		pos: 100,0
		text: "Tutorials"
		color: 1,0,0,1
		font_size: 40	
		

Now, what is happening here is that is referencing our Widgets class from the main python file. That has Widgets acting as a parent here, and now, using tabs, we can define some children of the Widget.

First, we see two button children. After that, we see another tab with a some parameters for those buttons.

It will be very easy to forget the required colons after the parents, and you won't really be served any explicit errors because of it.