Python code visualizer
Free online Python code visualizer: run your code step by step and see every variable, function call, list and object, with each line explained.
Opening the visualizer…
About the Python code visualizer
Type or paste a Python program, or pick an example, and press Run & visualize. StepVioz runs it in your browser with Pyodide (a full Python) and records every step; nothing is sent to a server.
Each step shows the line that ran, the call stack with every function's variables, lists, dictionaries and objects drawn as boxes with arrows, and the output so far. A sentence explains what happened, with the arithmetic worked out. input() reads lines from the input box.
See also
- Python Programming: the course
- Open-Source Contribution: the course
- Discrete Mathematics: the course
- Machine Learning: the course
- Coding Interview Prep: the course
- Computer Networks: the course
- Digital Logic Design: the course
- Computer Architecture: the course
- Probability and Statistics: the course
- Calculus and Linear Algebra: the course
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