Computer Science · PUBLIC INTERACTIVE LESSON

Watch Python Code Come to Life

Slow a program down to the speed of understanding. Follow its decisions, inspect its variables, and predict what happens next.

WHAT YOU WILL DISCOVER

Trace for and while loops
Understand conditions and branches
Predict output before running a program

COMPUTER SCIENCE LABPYTHON · CONTROL FLOW

Choose a program

Four read-only examples, with every execution step made visible.

lesson.py READ ONLY

1for i in range(1, 6):
2    print(i)

LIVE VARIABLES

Press Run or Step to begin.

Iteration 0

Predict the output, then follow the highlighted line.

OUTPUT CONSOLE

—

What is the last number printed?

What did we learn?

A for loop takes values from an iterable. A while loop checks its condition before each repetition. An if/else chooses one path. Indentation determines which instructions belong to a block. These preset traces demonstrate those rules without running arbitrary code.

Preparing your interactive lesson…

Where will your curiosity take you next?

Physics ↗Biology ↗Urdu ↗