Quick Answer
The answer is `a, b = func()` because Python directly supports tuple unpacking from function returns, allowing you to assign each element of the returned tuple to a separate variable in a single line. When a function returns multiple values as a tuple, Python automatically unpacks the sequence into the variables listed on the left side of the assignment, making the code clean and readable. On the Certified Entry-Level Python Programmer PCEP exam, this concept tests your understanding of tuple unpacking and how functions can return multiple values without needing explicit indexing. A common trap is trying to assign the entire tuple to a single variable or using incorrect syntax like `(a, b) = func()` (though that also works, the simpler form is preferred). Remember the memory tip: "Left side variables mirror the return order"—the number of variables must exactly match the number of returned values, or Python will raise a ValueError.
This PCEP practice question tests your understanding of functions, tuples, dictionaries and exceptions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer writes a function that returns multiple values as a tuple. Which of the following is a valid way to unpack the result into separate variables?
result = func(); a, b = result[0], result[1]
Why wrong: This works but is not unpacking.
a, b, c = func()
Why wrong: Unpacking mismatch if function returns only two values.
a = func()[0]; b = func()[1]
Why wrong: This calls the function twice.
a, b = func()
This is direct tuple unpacking.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
a, b = func()
Option D is correct because when a function returns multiple values as a tuple, Python allows tuple unpacking directly in an assignment statement. The syntax `a, b = func()` automatically unpacks the two-element tuple into the variables `a` and `b`, which is the standard and most Pythonic way to handle such a return.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
result = func(); a, b = result[0], result[1]
Why it's wrong here
This works but is not unpacking.
a, b, c = func()
Why it's wrong here
Unpacking mismatch if function returns only two values.
a = func()[0]; b = func()[1]
Why it's wrong here
This calls the function twice.
a, b = func()
Why this is correct
This is direct tuple unpacking.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Python Institute often tests the requirement that the number of variables on the left must exactly match the number of elements in the returned tuple, so candidates who choose option B fall into the trap of assuming extra variables are simply ignored or set to `None`.
Detailed technical explanation
Tuple unpacking works via Python's assignment statement semantics, where the left-hand side must have the same number of variables as the length of the iterable on the right-hand side. Under the hood, Python uses the `UNPACK_SEQUENCE` bytecode operation to efficiently distribute values. In real-world scenarios, this is commonly used with functions like `divmod()` or database queries that return multiple columns, ensuring clean, readable code without manual indexing.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the PCEP exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Functions, Tuples, Dictionaries and Exceptions — This question tests Functions, Tuples, Dictionaries and Exceptions — Read the scenario before looking for a memorised answer..
The correct answer is: a, b = func() — Option D is correct because when a function returns multiple values as a tuple, Python allows tuple unpacking directly in an assignment statement. The syntax `a, b = func()` automatically unpacks the two-element tuple into the variables `a` and `b`, which is the standard and most Pythonic way to handle such a return.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This PCEP practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCEP exam.
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