Python Tutor helps you do programming homework assignments in Python, Java, C, C++, and JavaScript. It contains a step-by-step visual debugger and AI tutor to help you understand and debug code.

Python Tutor is designed to imitate what an instructor in an introductory programming class draws on the blackboard: Instructors use it as a teaching tool, and students use it to visually understand code examples and interactively debug their programming assignments.

This is the only Python website that lets you visually debug your code step-by-step and get free AI help.

Here is a demo. Scroll down to compile and run your own code!

Python Tutor visualizations are well-suited to include in lecture slides, course handouts, and textbooks. You can also use presentation software (e.g., Google Slides, PowerPoint) to add text annotations, arrows, and other graphics to enhance these visualizations.

Python Tutor is a free tool that has been used by tens of millions of people since 2010 to visualize and debug code step-by-step. Despite its name, it also visualizes Java code ( in addition to C, C++ , and JavaScript) to help students understand …

Despite its name, Python Tutor is a widely-used web-based visualizer for C and C++. It is meant to help students in introductory and intermediate-level C/C++ courses.