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Python Tutor
Step-by-step Python execution visualizer. See how your code runs line by line with stack frames, heap objects, and pointer arrows.
Loading Python runtime...
Use ← → to step, Space to play/pause. Python runs entirely in your browser via WebAssembly — nothing is sent to a server.
Inspired by Python Tutor by Philip Guo. This is an independent client-side reimplementation using Pyodide.