Python Code Playground — Run & Debug Python Online

About the Python Playground

Code Visualizer’s Python playground is the best Python Tutor alternative. Write any Python code and watch it execute line by line, with real-time visualization of variables, memory allocations, reference counts, and the call stack. See how lists, dicts, and objects are stored in memory and traced through scope.

Perfect for learning Python fundamentals, debugging tricky behaviors like mutable default arguments or shallow vs deep copies, preparing for coding interviews, or teaching programming courses. Set breakpoints, step through function calls, and inspect every frame of execution.