Separate Returning a Value from Printing It
Track the caller’s returned value separately from visible output.
About 18 minutes, plus any extended practice
Supplied materials
- Paper and pencil; answers may also be spoken or typed.
- All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.
Learn the idea
A function can return a value to its caller, print a visible message, do both, or do neither. A printed number is not automatically the function’s returned value. In Python a function that reaches the end without an explicit return returns None. These paper descriptions state exactly what each function does.
Track the caller’s returned value separately from visible output. Do not substitute printed text for the return value.
Use this supplied case: Function returns 5 and prints nothing. Classify the stated function behavior. The task is to connect the given information to the computing idea. Write a short evidence trail so another learner can reproduce your choice. The simplified case describes the stated model, not every real system.
- Represent the supplied worked case with a labeled drawing, table or short trace.
- Track the caller’s returned value separately from visible output.
- Explain why the worked answer fits and why one alternative does not.
- Try the new check and practice cases; revisit the stated rule if your evidence does not match.
See the method in action
Function returns 5 and prints nothing. Classify the stated function behavior. The supported answer is Returns only. Track the caller’s returned value separately from visible output. Do not substitute printed text for the return value. A function can return a value to its caller, print a visible message, do both, or do neither.
Check your reasoning
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Helpful tips
- Track the caller’s returned value separately from visible output.
- Do not substitute printed text for the return value.
See the answer and explanation
Prints only, returns None
The supplied case states: Function prints 5 with no return. Classify the stated function behavior. Under the stated distinction, this identifies Prints only, returns None. A function can return a value to its caller, print a visible message, do both, or do neither. A printed number is not automatically the function’s returned value. In Python a function that reaches the end without an explicit return returns None. These paper descriptions state exactly what each function does. Track the caller’s returned value separately from visible output.
Take it further
Paper function prints 10 and has no return. Expected: visible 10 but returned None. Adding return 10 changes the caller’s value while the output can remain 10.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
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