How to create a Calculator GUI with Python programming language Source code free . Here I will use the Kivy package in Python to build a Calculator GUI. Kivy is a free, Open Source Python library that enables the rapid and easy development of highly interactive cross-platform applications. Kivy’s execution speed is the same as compared to the other mobile development alternatives like Java for Android and Objective C for iOS.
Kivy offers an excellent balance of performance and portability in various hardware and software environments.
Also, Read -100+ Android Projects Solved and Explained.
Calculator GUI with Python – We don’t need to use any file named as file.kv for building a calculator, as a calculator is a very simple application. Let’s see how to build a simple calculator GUI with Python:
from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
class myApp(App):
def build(self):
root_widget = BoxLayout(orientation='vertical')
output_label = Label(size_hint_y = 0.75, font_size=50)
button_symbols = ('1', '2', '3', '+',
'4', '5', '6', '-',
'7', '8', '9', '.',
'0', '*', '/', '=')
button_grid = GridLayout(cols=4, size_hint_y=2)
for symbol in button_symbols:
button_grid.add_widget(Button(text=symbol))
clear_button = Button(text = 'Clear', size_hint_y=None, height=100)
def print_button_text(instance):
output_label.text += instance.text
for button in button_grid.children[1:]:
button.bind(on_press=print_button_text)
def resize_label_text(label, new_height):
label.fontsize = 0.5*label.height
output_label.bind(height=resize_label_text)
def evaluate_result(instance):
try:
output_label.text = str(eval(output_label.text))
except SyntaxError:
output_label.text = 'Python Syntax error!'
button_grid.children[0].bind(on_press=evaluate_result)
def clear_label(instance):
output_label.text = " "
clear_button.bind(on_press=clear_label)
root_widget.add_widget(output_label)
root_widget.add_widget(button_grid)
root_widget.add_widget(clear_button)
return root_widget
myApp().run()NOTE – In order to run the project of Python, you have to download Python IDLE or Pycharam. In the video I have explained how to download and install it.
Download and Install Python
Download and install Pycharm
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