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Functions, Tuples, Dictionaries and Exceptions →hardMultiple ChoiceObjective-mapped

PCEP Practice Question: Functions, Tuples, Dictionaries and Exceptions

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.

Exhibit

>>> def gen():
...     yield 1
...     yield 2
...     yield 3
>>> g = gen()
>>> print(next(g))
>>> print(next(g))
>>> print(next(g))
>>> print(next(g))

Refer to the exhibit. What is the output?

Exhibit

>>> def gen():
...     yield 1
...     yield 2
...     yield 3
>>> g = gen()
>>> print(next(g))
>>> print(next(g))
>>> print(next(g))
>>> print(next(g))

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

1\n2\n3\nStopIteration

The code iterates over a tuple (1, 2, 3) using an iterator created by iter(). The for loop internally calls next() on the iterator until StopIteration is raised. After the loop finishes, the final print() statement executes, but since the iterator is exhausted, calling next() again raises StopIteration, which is not caught, so the program terminates with that exception. Thus, the output is 1, 2, 3 each on a new line, followed by the StopIteration error message.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates forget that after a for loop exhausts an iterator, any subsequent manual call to next() on the same iterator will raise StopIteration, not return None or silently fail.

Detailed technical explanation

How to think about this question

Under the hood, the for loop in Python uses the iterator protocol: it calls iter() on the iterable to get an iterator, then repeatedly calls next() on that iterator. When the iterator is exhausted, next() raises StopIteration, which the for loop catches internally to terminate. However, if next() is called manually after the loop, the StopIteration propagates uncaught. This behavior is fundamental to Python's iteration model and is defined in PEP 234. In real-world scenarios, this matters when manually managing iterators with next() in generator functions or custom iterators, where forgetting to handle StopIteration can crash a program.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.

TExam Day Tips

  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

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

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PCEP question test?

Functions, Tuples, Dictionaries and Exceptions — This question tests Functions, Tuples, Dictionaries and Exceptions — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: 1\n2\n3\nStopIteration — The code iterates over a tuple (1, 2, 3) using an iterator created by iter(). The for loop internally calls next() on the iterator until StopIteration is raised. After the loop finishes, the final print() statement executes, but since the iterator is exhausted, calling next() again raises StopIteration, which is not caught, so the program terminates with that exception. Thus, the output is 1, 2, 3 each on a new line, followed by the StopIteration error message.

What should I do if I get this PCEP question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 2026

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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.