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How to Create a Simple Calculator with Python (Source Code)

Learn how to create a simple calculator with Python. This calculator will be able to add, subtract, multiply, and divide two numbers.
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Create a Simple Calculator with Python - Python is a powerful programming language that is widely used in many industries today. Python is easy to learn for beginners and has many modules and libraries that allow for robust programming. In this blog post, we will walk through how to create a basic calculator with Python. This tutorial is geared towards beginners with little to no prior experience with Python.

Create a Simple Calculator with Python (Source Code)

Python is a versatile language that can be used for a wide variety of applications. In this blog post, we will be using Python to create a basic calculator. This project is perfect for beginners with little to no experience with Python.

Creating a calculator with Python is a great way to learn about both the language and how to code in general. This project will walk you through the basics of Python programming as well as how to read and write code. By the end of this project, you will have created a functioning calculator that can perform basic arithmetic operations.

Set up your development environment

In order to start coding the calculator, you will need to set up a development environment on your computer. This environment will allow you to write, run, and test your code.

There are a few different ways to set up a Python development environment. The most common way is to use a text editor like Sublime Text or Atom. These editors are lightweight and easy to use. They also have many features that make coding in Python easier, like code completion and syntax highlighting.

Another way to set up a development environment is to use an Integrated Development Environment (IDE). IDEs are more full-featured than text editors and can be used for a variety of programming languages. Some popular Python IDEs are PyCharm and Eclipse.

For this project, we will be using PyCharm IDE. If you do not have an IDE installed on your computer, you can download PyCharm IDE for free from their website. Don't have a computer? No problem... You can download and make use of Python on your Android Phone by downloading Pydroid from Google PlayStore.

Once you have installed an IDE, you are ready to move on to the next step.

Create the project files

Now that you have your development environment set up, you can create the project files. For this project, you will need two files:

  • calculator.py: This is the file where you will write the code for your calculator.
  • README.md: This is a file that contains information about your project.

You can create these files using your preferred IDE.

Write the code

Now that you have your project files set up, you can start writing the code for your calculator.

  • The first thing you need to do is import the tkinter module. This module contains functions that will be used in the calculator.
from tkinter import *
  • Next, you need to create a function that will take two numbers as parameters and return the sum of those numbers. This function will be used to add two numbers together.
  • After that, you need to create a function that will take two numbers as parameters and return the difference of those numbers. This function will be used to subtract one number from another.
  • Next, you need to create a function that will take two numbers as parameters and return the product of those numbers. This function will be used to multiply two numbers together.
  • Finally, you need to create a function that will take two numbers as parameters and return the quotient of those numbers. This function will be used to divide one number by another.

Now that you have created all of the necessary functions, you can start writing the code for the calculator.

Below is the Source Code for this project

NOTE: Double-click on the below codes to copy

from tkinter import *
def iCalc(source, side):
    storeObj = Frame(source, borderwidth=4, bd=4, bg="red")
    storeObj.pack(side=side, expand=YES, fill=BOTH)
    return storeObj

def button(source, side, text, command=None):
    storeObj = Button(source, text=text, command=command)
    storeObj.pack(side=side, expand=YES, fill=BOTH)
    return storeObj

class app(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.option_add('*Font', 'arial 20 bold')
        self.pack(expand=YES, fill=BOTH)
        self.master.title('Calculator')

        display = StringVar()
        Entry(self, relief=RIDGE, textvariable=display,
              justify='right', bd=30, bg="red").pack(side=TOP, expand=YES, fill=BOTH)

        for clearButton in (["C"]):
            erase = iCalc(self, TOP)
            for ichar in clearButton:
                button(erase, LEFT, ichar, lambda
                       storeObj=display, q=ichar: storeObj.set(''))

        for numButton in ("789/", "456*", "123-", "0.+"):
            FunctionNum = iCalc(self, TOP)
            for iEquals in numButton:
                button(FunctionNum, LEFT, iEquals, lambda
                       storeObj=display, q=iEquals: storeObj
                       .set(storeObj.get() + q))

        EqualButton = iCalc(self, TOP)
        for iEquals in "=":
            if iEquals == '=':
                btniEquals = button(EqualButton, LEFT, iEquals)
                btniEquals.bind('<ButtonRelease-1>', lambda e, s=self,
                                storeObj=display: s.calc(storeObj), '+')
            else:
                btniEquals = button(EqualButton, LEFT, iEquals,
                                    lambda storeObj=display, s=' %s ' % iEquals: storeObj.set
                                    (storeObj.get() + s))

    def calc(self, display):
        try:
            display.set(eval(display.get()))
        except:
            display.set("ERROR")

if __name__ == '__main__':
    app().mainloop() 

Run the code

Now that you have written the code for the calculator, you can run it to test it.

To run the code, you need to open the calculator.py file in your text editor/IDE and click the "run" button. Alternatively, you can use the shortcut keys Ctrl + B (Windows) or Cmd + B (macOS).

How to Create a Simple Calculator with Python

Test the code

After you have run the code, you should test it to make sure it is working properly.

To test the code, you need to input two numbers and an operator. The code should then output the result of the calculation.

Deploy the code

Now that you have written and tested the code for the calculator, you can deploy it. There are many ways to deploy Python code. For this project, we will be using Heroku.

Heroku is a cloud platform that allows you to deploy applications written in many different programming languages, including Python. To deploy the code to Heroku, you need to create a file called Procfile in the root directory of your project. The Procfile is used to tell Heroku what type of application you are deploying and how to run it.

For this project, the Procfile should look like this:

web: python calculator.py

This tells Heroku that the application is a web application written in Python and the name of the file that contains the code is calculator.py.

After you have created the Procfile, you need to create a file called requirements.txt in the root directory of your project. The requirements.txt file is used to specify all of the dependencies for your project. For this project, the requirements.txt file should look like this:

Flask

This tells Heroku that the only dependency for this project is the Flask web framework.

Now that you have created the necessary files, you can deploy the code to Heroku.

  • First, you need to create a Heroku account and install the Heroku CLI.
  • Once you have installed the Heroku CLI, you need to login to your account using the following command:

heroku login

  • After you have logged in, you need to create a new Heroku application using the following command:
heroku create

This will create a new Heroku application and set up a remote repository that you can push your code to.
  • Now, you can push your code to the Heroku remote using the following command:

git push heroku master

This will push your code to the Heroku remote and deploy your application.

  • Once the code has been deployed, you can view your application by opening the following URL in your browser:

https://your-app-name.herokuapp.com/

NOTE: Change the colored part in the URL above with your app name

Conclusion

In this blog post, we have walked through how to create a basic calculator with Python. This project is perfect for beginners with little to no experience with Python.

Creating a calculator with Python is a great way to learn about both the language and how to code in general. This project will walk you through the basics of Python programming as well as how to read and write code. By the end of this project, you will have created a functioning calculator that can perform basic arithmetic operations.

We hope you found our article helpful; if so, don't hesitate to share it with others using the share buttons below.

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