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Creating a Calculator with Python

06 Dec 2022, 03:29 GMT+10

Want to build a calculator with Python? This article demonstrates how to create your coding!

Python, a high-level programming language, is ideal for this coding endeavor. You may confidently develop a simple calculator with a few simple steps.

Willing to learn more? Let's get started!

Why Create a Basic Calculator?
Python programming is an approachable technique for children ages 8 to 18 to learn coding.

You can build a calculator capable of performing addition, subtraction, multiplication, and division. This is an excellent method for learning the fundamentals of a programming language (and preparation for more advanced coding).

How to construct a calculator in Python

While learning concepts such as conditionals and while loops, young programmers can enhance their general coding skills. In addition, it provides experience with numbers, math, and command-line programming.

This type of coding assignment opens up numerous opportunities. From video games to mobile apps to artificial intelligence, an ambitious coder can get a head start on the future's many fascinating vocations and hobbies, like video games, mobile apps, and AI.

What is Required to Start
Python is an open-source language for programming. It is free for all!

If you do not have Python 3, you can get it from its official page. It supports multiple operating systems (including Windows, MacOS, and Linux). In addition, the download procedure contains a link to useful Python documentation.

Are you new to Python? Consult the following materials:

  • Python Coding 101 (ages 11 and up).
  • Create a Zoom Virtual Background (beginner)
  • Symbolize the Solar System (beginner graphics)

Want something more sophisticated? The following are Python tutorials:

  • Game of Rock-Paper-Scissors (intermediate)
  • Make a Pet Simulator (intermediate)
  • How to Create Graphs in Python (intermediate to advanced)

Creating your Python program is enjoyable but initially intimidating. Not to worry! You will get the hang of it with repetition and the proper instruction.

Python Programming Jargon
Before beginning the Python course, let's review some terminology and concepts!


Tkinter Python provides numerous methods for creating a Graphical User Interface (or GUI). A GUI offers users various windows, buttons, and other widgets to interact with a program.

Along with PyQT and wxPython, Tkinter is one of the most widely used GUIs. Tkinter makes it simple and quick to construct various apps, such as a GUI calculator.

Along with the main loop method, which enables Tkinter to launch an application, this technique enables the creation of a GUI calculator. After learning how to create a simple calculator software, you can advance your coding abilities by creating a GUI version!

Def and Elif
Def is the name of the function definition. Following this are function parameters enclosed in parentheses. Following this, a colon is added to the line of code. The colon signifies the start of the functional body.

Elif (short for "else if") enables users to evaluate several expressions. For example, if the condition for 'if' is True, other elif blocks are evaluated. If all other conditions evaluate as True, the else clause is executed.

Additional Python Terms Algorithm: A set of instructions for solving a certain problem.

A conditional statement is used when a given condition is either true or false.

  1. The Eval function evaluates an expression and returns the result as a whole number.
  2. Invalid input: Information from the user that is not acceptable.
  3. Lambda is a one-line function that lowers the number of code lines.
  4. Num: An abbreviation for number data formats that store numeric values.
  5. Recursion is the process of a function calling itself.
  6. Source code is programmer-generated code.
  7. User input: Information supplied by the user using input devices such as a keyboard.
  8. While loop: Repeats the execution of statements until a specific condition is met.

Calculator Program Tutorial
Now is the time to write your Python program!

There are numerous methods for creating a calculator. Today, we will examine a simple calculator for addition, subtraction, multiplication, and division.

Calculator Code

Take a look at the code shown above. In this example, you can choose two different numbers for each function. Num1 and num2 denote these quantities.

As can be seen, each of the four functions is represented by its own set of codes.

Using our Python calculator, the first number (num1) can be added, subtracted, multiplied, or divided by the second (num2).

The following section of the code accepts user input. In this example, the elif function branching allows you to select one of the four mathematical procedures.

The number '1' denotes addition, '2' denotes subtraction, '3' denotes multiplication, and '4' denotes division.

After choosing an operation, input the two integers that comprise your math problem. For example, to discover the answer to 15 x 10, enter 15 as the first number (num 1) and ten as the second number (num 2). (num2).

If all requirements for a certain operation are met, in this example multiplication, then the body of 'otherwise' is executed, resulting in the output of the answer: 150.

This equation employs full numbers (known as integers). In addition, we do not use decimal points. This is due to the code's int() method. Using the float() function, it can support decimal values.

Remember that if you type something invalid, such as letters, the application will display the message "Invalid input." In the above example, 'math' was entered instead of a numeric value. This causes a 'ValueError' error message.


You have just learned how to create your Python calculator program. Continue to practice and acquire new skills. You will soon be able to create your games and applications. Continue your great effort!

Want to continue learning? Need Help?
We hope you found this Python programming tutorial to be helpful!

Creating your calculator is enjoyable. With the assistance of a friendly and professional tutor, you can also acquire new coding abilities.

At Matic Academy, we provide programming courses for children. Your student can create their coding projects with personalized one-on-one instruction.

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