Calculator Example - Kivy Typing CST Test

Calculator Example — Kivy Code

A simple calculator UI built using Kivy layout widgets.

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button

class Calculator(App):
	def build(self):
		self.result = TextInput(multiline=False, readonly=True)
		layout = GridLayout(cols=4, spacing=5, padding=10)
		layout.add_widget(self.result)
		buttons = ['7','8','9','/','4','5','6','*','1','2','3','-','0','.','=','+']
		for b in buttons:
		btn = Button(text=b, on_press=self.on_button)
		layout.add_widget(btn)
		return layout

	def on_button(self, instance):
		if instance.text == '=':
		try:
		self.result.text = str(eval(self.result.text))
		except:
		self.result.text = 'Error'
		else:
		self.result.text += instance.text

if __name__ == '__main__':
	Calculator().run()

Kivy Language Guide

Kivy is an open-source Python framework for building cross-platform multitouch applications on Android, iOS, Windows, macOS, Linux, and Raspberry Pi. It provides a UI toolkit, gesture support, animations, layouts, and a declarative KV language for rapid app development.

More Kivy Typing Exercises

Practice Other Languages