Parameters and Return

Main idea

Parameters are inputs; return gives output back.

Tip

Prefer return over print.

Watch out

Forgetting return gives None.

Read this next

This lesson is about Parameters and Return. You are in the Functional Programming part of the course.

Main idea:
Parameters are inputs; return gives output back.

How to learn it: type a very small program first. Run it. Change one line and run again.

Tip:
Prefer return over print.

Common mistake:
Forgetting return gives None.

Your challenge:
Area function returning computed result.

Scroll down to the challenge lab. Run your code there. When the output meets the task and the checks pass, press the green button to finish this topic.

Example code

Copy this example if it helps. Change it so it matches Parameters and Return.

# Topic: Parameters and Return
def main():
    sample = "edit me"
    # TODO: apply Parameters and Return concept here
    result = sample
    print("Result:", result)

if __name__ == "__main__":
    main()

Challenge

Area function returning computed result.

Before you can finish: your output should include at least 16 characters; at least 1 non-empty line(s); no crash traceback—fix errors until the program runs cleanly.

Use Run. Read the output. Change your code until the task is done.

Starter reference

# Challenge starter for Parameters and Return
def solve():
    # Write your solution here
    pass

print("Update solve() and run")

Your code

The first Run may load Python in your browser (one-time). Later runs are faster.

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