What you will learn
Define functions, pass arguments and return results.
Practise
Add type hints and reject negative dimensions.
Common mistake
Calling a function and printing its result are separate actions unless the function prints internally.
Functions and return values
PRACTICE LAB
Python source · .pyRead. Edit. Run.
Experiment with the program below. Your code and input are sent to the selected compiler only when you run it.
Tab indents · Shift+Tab unindents · Esc then Tab leaves the editor · Ctrl/Cmd+Enter runs · Ctrl/Cmd+S saves a draft
Changes save automatically to your account.
Input / output example
Example inputNo input required.Expected output for the original program
24
Output will appear here.
Debugging Lab
Interactive Python Object Visualizer
Educational simulation — object identities and execution steps are illustrative.