Calculator GUI Using Python Kivy

The scientific calculator GUI project is an application developed using Python and the Kivy framework, designed to provide a graphical user interface (GUI) for performing complex mathematical calculations. This project utilizes Kivy's cross-platform capabilities to create an interactive and user-friendly calculator interface with scientific functions.

Python Kivy Code

from kivy.app import App
      from kivy.uix.widget import Widget
      from kivy.lang import Builder
      from kivy.core.window import Window

Window.size = (360,640)

Builder.load_string("""
      <MyLayout>
          BoxLayout:
          orientation: 'vertical'
          size: root.width,root.height

TextInput:
            id: calc_input
            text: '0'
            halign: 'right'
            font_size: 65
            size_hint: (1, .15)

GridLayout:
            cols: 4
            rows: 5

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '**'
              on_press: root.math_sign('**')

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: 'C'
              on_press: root.clear()

Button:
              id: clear
              size_hint:(.2,.2)
              font_size: 50
              text: u'\u00AB'
              on_press: root.remove()

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '/'
              on_press: root.math_sign('/')

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '7'
              background_color:(157/255,157/255,157/255,1)
              on_press: root.button_press(7)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '8'
              background_color:(157/255,157/255,157/255,1)
              on_press: root.button_press(8)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '9'
              background_color:(157/255,157/255,157/255,1)
              on_press: root.button_press(9)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '*'
              on_press: root.math_sign('*')			
            Button:
                size_hint:(.2,.2)
              font_size: 50
              text: '4'
              background_color:(157/255,157/255,157/255,1)
              on_press: root.button_press(4)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '5'
              background_color:(157/255,157/255,157/255,1)	
                      on_press: root.button_press(5)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '6'
              background_color:(157/255,157/255,157/255,1)   
                      on_press: root.button_press(6)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '-'
              on_press: root.math_sign('-')

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '1'
                background_color:(157/255,157/255,157/255,1)	
                      on_press: root.button_press(1)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '2'
              background_color:(157/255,157/255,157/255,1)   
                      on_press: root.button_press(2)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '3'
              background_color:(157/255,157/255,157/255,1)
              on_press: root.button_press(3)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '+'
              on_press: root.math_sign('+')

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '+/-'
              background_color:(157/255,157/255,157/255,1)
              on_press: root.pos_neg()

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '0'
                background_color:(157/255,157/255,157/255,1)
                      on_press: root.button_press(0)

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '.'
              background_color:(157/255,157/255,157/255,1)
              on_press: root.dot()

Button:
              size_hint:(.2,.2)
              font_size: 50
              text: '='
              on_press: root.equals()			   
          """)

class MyLayout(Widget):
          def clear(self):
              self.ids.calc_input.text ='0'

def remove(self):
              prior = self.ids.calc_input.text
              prior = prior[:-1]
              self.ids.calc_input.text = prior

def pos_neg(self):
              prior = self.ids.calc_input.text

if '-' in prior:
                  self.ids.calc_input.text = f'{prior.replace("-","")}'
              else:
                  self.ids.calc_input.text = f'-{prior}'

def button_press(self,button):
              prior = self.ids.calc_input.text

if 'Error' in prior:
                  prior = ''

if prior == '0':
                  self.ids.calc_input.text = ''
                  self.ids.calc_input.text = f'{button}'

else:
                  self.ids.calc_input.text = f'{prior}{button}'

def dot(self):
              prior = self.ids.calc_input.text
              num_list = prior.split('+')

if '+' in prior and "." not in num_list[:-1]:
                  prior = f'{prior}.'
                  self.ids.calc_input.text = prior

elif '.' in prior:
                  pass
              else: 
                 prior = f'{prior}.'
                 self.ids.calc_input.text = prior

def math_sign(self,sign):
              prior = self.ids.calc_input.text 
              self.ids.calc_input.text = f'{prior}{sign}'

def equals(self):
              prior = self.ids.calc_input.text 
              try:
                  answer = eval(prior)
                  prior = self.ids.calc_input.text = str(answer)
              except:
                   prior = self.ids.calc_input.text = 'Error'

class CalculatorApp(App):
          def build(self):
                return MyLayout()

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

Output

Key Features

Graphical User Interface (GUI)

Implements a modern and intuitive GUI using Kivy, a Python framework for developing multi-touch applications.

Includes buttons, input fields, and display areas to facilitate user input and output of mathematical expressions.

Scientific Functions

Integrates standard and advanced mathematical functions into the calculator interface.

Supports scientific operations such as exponentiation, trigonometric functions, logarithms, square root, factorial, and more.

Input and Output Handling

Displays the entered expressions and computed results in a visually appealing format on the calculator display.

Cross-Platform Compatibility

Utilizes Kivy's cross-platform support to run the calculator application on various devices and operating systems, including Windows, macOS, Linux, Android, and iOS.

Technology Stack

Python Programming Language: Implements the calculator logic and user interface using Python.

Kivy Framework: Leverages Kivy for developing the GUI components, event handling, and layout management.

Mathematical Libraries: Utilizes Python's math module or custom functions to perform scientific calculations and functions.

User Interface Design Tools: Employs Kivy's kv language for designing the graphical layout and styling the calculator interface.

Workflow

User Input

Users interact with the calculator by clicking on buttons corresponding to numerical digits, mathematical operations, and scientific functions.

Expression Parsing

Parses the input mathematical expression to identify and separate numerical values, operators, and function calls.

Calculation and Evaluation

Utilizes Python's mathematical functions and algorithms to evaluate the parsed expression and compute the result.

Handles complex calculations involving scientific functions and mathematical constants.

Display and Output

Displays the entered expression and computed result on the calculator's output area or display widget.

Supports formatting of numerical values and scientific notation for clarity and precision.

Potential Use Cases

Education and Learning: Provides students and educators with a tool for performing scientific calculations and exploring mathematical concepts.

Professional Use:Assists engineers, scientists, and researchers in conducting complex calculations and analyses.

Personal Utility: Serves as a convenient and feature-rich alternative to standard calculators for everyday use.

The scientific calculator GUI project using Python and Kivy exemplifies the combination of programming skills, graphical design, and mathematical computation to create an interactive calculator application. This project offers a practical and engaging tool for users to perform scientific calculations efficiently and effectively within a modern and accessible user interface.

A Calculator GUI Using Python Kivy!

By Neelkanth

Project Overview

Python Kivy Code

Output

Key Features

Graphical User Interface (GUI)

Scientific Functions

Input and Output Handling

Cross-Platform Compatibility

Technology Stack

Workflow

User Input

Expression Parsing

Calculation and Evaluation

Display and Output

Potential Use Cases

A Calculator GUI Using Python Kivy! By Neelkanth

Project Overview

Python Kivy Code

Output

Key Features

Graphical User Interface (GUI)

Scientific Functions

Input and Output Handling

Cross-Platform Compatibility

Technology Stack

Workflow

User Input

Expression Parsing

Calculation and Evaluation

Display and Output

Potential Use Cases

A Calculator GUI Using Python Kivy!

By Neelkanth