Python Visual Lab

Python Visual Lab

Python Tutor: Learn Python Visually

Looking for a Python tutor that makes code easier to understand? Explore guided visual lessons and watch each line change variables, choose a branch or repeat a loop. Python Visual Lab is a self-paced learning tool, not a one-to-one tutoring service or the separate Python Tutor website.

Python code

1x = 10
2 
3if x > 5:
4    print("Greater")
5else:
6    print("Smaller")

Variables / Memory

Memory is empty.

Execution

STEP 1 / 6Step 1 of 6. Program starts.

Program starts.

Output

Flow chart

RanNowTrueFalseChecked, not taken◇ decision · ▱ input/output
StartStartx = 10x = 10x > 5?x > 5?print("Greater")print("Greater")print("Smaller")print("Smaller")EndEndTRUEFALSE

Practice with the interactive Python tutor

Practice 12 topics: variables, decisions, for and while loops, lists, functions, strings, dictionaries, tuples, sets, comprehensions and exceptions. Each topic includes an exercise, a quiz and step-by-step answers. Your completion tracker saves in this browser.

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Try the free Python code visualizer

Move beyond the final answer: see the steps that produce it. Paste a short Python program into the Visualizer and follow its variables, output and flowchart one step at a time. Try changing a value, then compare what happens.

Open the free Visualizer

The public Visualizer and free lessons need no account. Libraries that open desktop windows need a Python editor on your computer.

A beginner's path through Python

Start with Python syntax, then learn how if / else decisions choose a path. Explore for loops and while loops before moving to lists and functions.

Follow the beginner's Python guide for an ordered learning path. The complete lesson catalog requires a free learner account and includes quizzes and saved progress.

Learn by predicting, watching and changing

  1. Read a small example and predict its output.
  2. Step through the visualization and compare each variable with your prediction.
  3. Change one condition or input and see how the program takes a different path.

For a comparison with the separate Python Tutor tool, read our Python Tutor alternative page.

Try your own code

Paste any code into the free visualizer, or sign up free for all visual lessons with quizzes and progress tracking.

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