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

PCEP Tuple Immutability Practice Question

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. A key principle to apply: tuple Immutability. 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 outer(x):
...     def inner(y):
...         return x + y
...     return inner
>>> add5 = outer(5)
>>> add3 = outer(3)
>>> print(add5(10), add3(10))

Refer to the exhibit. What is the output of the code?

Exhibit

>>> def outer(x):
...     def inner(y):
...         return x + y
...     return inner
>>> add5 = outer(5)
>>> add3 = outer(3)
>>> print(add5(10), add3(10))

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

✓

15 13

The code defines a function `func` that attempts to modify a tuple element (`t[1] = 10`). Since tuples are immutable, this raises a `TypeError`. The `except` block catches the error and prints `x` (15) followed by `t[1]` (13), resulting in the output '15 13'. Therefore, the correct answer is C.

Key principle: Tuple Immutability

Common exam traps

Common exam trap: answer the scenario, not the keyword

Candidates may overlook tuple immutability and mistakenly assume the modification succeeds. Additionally, the order of printed values (x first, then t[1]) can cause confusion if the exhibit's print statement is not carefully read.

Detailed technical explanation

How to think about this question

Tuples in Python are immutable sequences, meaning their elements cannot be changed after creation. Attempting to assign to a tuple element (e.g., `t[1] = 10`) raises a `TypeError` with the message 'tuple object does not support item assignment'. The `except` block catches this exception, allowing the program to continue and print the original values. In real-world scenarios, this immutability is used to create hashable keys for dictionaries or to ensure data integrity when passing arguments to functions.

KKey Concepts to Remember

  • Tuple Immutability
  • Exception Handling

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

Tuple Immutability

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. Tuple Immutability 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.

Review tuple Immutability, then practise related PCEP questions on the same topic to reinforce the concept.

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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 — Tuple Immutability.

What is the correct answer to this question?

The correct answer is: 15 13 — The code defines a function `func` that attempts to modify a tuple element (`t[1] = 10`). Since tuples are immutable, this raises a `TypeError`. The `except` block catches the error and prints `x` (15) followed by `t[1]` (13), resulting in the output '15 13'. Therefore, the correct answer is C.

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

Review tuple Immutability, then practise related PCEP questions on the same topic to reinforce the concept.

What is the key concept behind this question?

Tuple Immutability

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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.