Python Visualizer

Last Updated : 6 Jan 2026

A Python Visualizer is a tool that is used to study how Python code works, flows, and executes step by step.

The visualization makes loops, functions, code blocks, variables, and the flow of the code easier to understand.

It represents how a code actually runs in a memory graphically. It shows various functions like:

  • Creating variables
  • Changing of values
  • Functions call and return
  • Studying line-by-line execution

Advantages of Python Visualizer

  • It helps beginners understand the core working of the code.
  • It is useful for finding bugs easily and debugging.
  • It is used in teaching concepts like recursion, loops, and scope.
  • It enables us to read, understand, interpret, and inspect every line of the code.

Popular Python Visualizer Tools

There are multiple Python visualizer tools available online, such as PythonTutor, OnlineGDB, and Visual Studio Code Debugger.

PythonTutor

PythonTutor is an online visualizer tool that supports Python, JavaScript, C, C++, and Java.

According to PythonTutor.com, they like to replicate how a teacher teaches programming, and it works on a blackboard. Many Students, Teachers, Coders, and other professionals use this visualizer tool to see how their programs flow interactively.

OnlineGDB

GDB Online is a web-based compiler and debugging platform that supports multiple programming languages, such as C, C++, Python, PHP, Ruby, C#, OCaml, VB, Perl, Swift, Prolog, JavaScript, Pascal, COBOL, as well as HTML, CSS, and JS. It allows users to write, compile, execute, and debug code online from anywhere in the world without requiring local setup.

We just need to write the Python code in the OnlineGDB Python Visualizer and click on the “Run” button to execute it.

Visual Studio Code Debugger

Visual Studio Code provides a powerful built-in debugger for Python through its Python extension. It enables users to visualize program execution step by step using breakpoints, the call stack, variable inspection, and the debug console. This makes it easier to understand how Python code flows, how values change in memory, and how functions are called and returned.

To use it as a Python visualizer, we simply write Python code in VS Code, set breakpoints, and start debugging. The debugger pauses execution line by line, which helps students, developers, and professionals in analyzing logic, tracing errors, and understanding program behavior in a structured and interactive way.

Example

We have taken this code to find whether the number is Prime or not.

Visualizing Above Program

Python Visualizer

The visualization of the above code explains everything in detail, which makes it easier to understand the working of the code. It shows what's happening inside the program and how it executes to deliver an output.

Conclusion

A Python Visualizer is a tool that is used to study how Python code works, flows, and executes step by step. The visualization makes loops, functions, code blocks, variables, and the flow of the code easier to understand. PythonTutor, OnlineGDB, and Visual Studio Code Debugger are popular online data visualization tools. We learnt about various advantages of Python Visualizer, and one of them is that it helps beginners understand the working of code through graphical methods.