Kivy Tutorial 3 : Kivy Calculator

In part 3 of my Kivy tutorial series we'll create a working calculator app in one video. We'll cover how to use layouts inside of other layouts, event handling, TextInput, executing code based on widget events, and much more.

Thank you to Patreon supports like the following for helping me make this video

@kyleaisho
@thetwistedhat
vjFaLk

[kennethbarr]

I just wanted to say that this is easily the most helpful tutorial series that I've ever seen. Thank you so much for making these.

[hashroot]

You are the most awesome guy on the internet. Really thanks for these great tutorials. I was struggling to get a hang of Kivy but now everything is clear. THANKS!!

[tommccann]

These tutorials are awesome. There's so much stuff that isn't explained adequately in the documentation, and not described very well in the various Kivy books (I have all of them). A big thank you from me.

[Apchenail]

Raise my hat to you Derek Banas, thank you for the making such high quality content.

[rjaraw]

“If you have questions, please leave a comment below”... not even saying “please subscribe and tap the bell button”

I like this guy

[snamone]

The best KIVY video I have seen so far. Thank You!!! Book sold!!!

[shanelarsen]

You the man Derek! It seems whenever I discover a new programming tool, you're right here to walk me through it. So, thank you. :)

[blakemckenna]

Great tutorial series Derek. Thanks for the taking the time to put these together. Very helpful!!!

[AnkushChauhanMystic]

Way to go Derek! What a cool way to demo a complex subject. I would be learning more of Kivy from you! :)

[chriszuidema]

All your Kivy tutorials are really helpful!

[nicbongo]

Hey Derek. Total noob here, but amazingly, I'm seeing the logic as you go through it which is really exciting! I can actually see a way of my ideas manifesting, so thanks bunches!

[eyes.of.lenses]

Great! one of the best tutorial series ever seen!

[handsomegod]

these tutorials are really awesome and clear enough to understand, thanks!

[geetcyberlab]

The team of geetechlab thanks you for this amazing tutorial its very simplified and informative to our team we do enjoy your tutorials...

[tonyiguru]

As usual, I made errors, but this time, they turned out to be an inspiration. The calculator was in the shape of a piano keyboard. Does Kivy have the potential to make a simple polyphonic keyboard? Yes, I want sound.
As usual thanks much for the lessons.

[giacomail]

the tutorial is great. Easy to understand. Just one point to make it even better: it would be easier to understand what you are writing (and why) in kv file, if you show at the beginning the image of the calculator you are going do build.
Thanks

[poornachandra]

i have no idea why Kivy-Official page doesnt support you! u make such great videos.

[HackTheREALITY]

You made me understand the backend in kivy. Thank you! What is the display property stand for?

[you]

I dont understand how you imported grid layout, used it, but inside it you used box layout. Wouldnt i need to import box layout to? Can you explain that?

[vasfigumus]

Hello Derek,
What is the point of saying "if calculation" ?
It is already a function expecting a paramater, is it a sanity check?