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.
Which TWO of the following are valid ways to create a dictionary with initial key-value pairs? (Select exactly 2)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
d = {'a': 1, 'b': 2}
Option A is correct because it uses the standard literal syntax for creating a dictionary with initial key-value pairs. The curly braces `{}` with colon-separated keys and values are the most common and direct way to define a dictionary in Python.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
d = {'a': 1, 'b': 2}
Why this is correct
Standard dictionary literal.
Related concept
Read the scenario before looking for a memorised answer.
✗
d = ('a'=1, 'b'=2)
Why it's wrong here
Parentheses and assignment are not valid syntax.
✗
d = dict.fromkeys(['a', 'b', 'c']) # without value
Why it's wrong here
Valid but creates keys with None values, not with initial pairs as given; but the stem asks for initial key-value pairs, so not suitable.
✓
d = dict(a=1, b=2)
Why this is correct
Keyword arguments to dict() create a dictionary.
Related concept
Read the scenario before looking for a memorised answer.
✗
d = dict(['a', 'b'], [1, 2])
Why it's wrong here
dict() takes at most one argument; this is invalid.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the distinction between the literal `{}` syntax and the `dict()` constructor, and candidates may mistakenly think that `dict()` can accept two separate lists as positional arguments, similar to how `zip()` works, or that parentheses can be used to define a dictionary.
Detailed technical explanation
How to think about this question
The `dict()` constructor can accept keyword arguments (as in option D) where the parameter names become string keys, but this only works if the keys are valid Python identifiers. The literal `{}` syntax (option A) is more flexible, allowing any hashable type as a key. Under the hood, Python's dictionary uses a hash table to store key-value pairs, providing O(1) average-case lookup, insertion, and deletion.
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.
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: d = {'a': 1, 'b': 2} — Option A is correct because it uses the standard literal syntax for creating a dictionary with initial key-value pairs. The curly braces `{}` with colon-separated keys and values are the most common and direct way to define a dictionary in Python.
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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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.
Question Discussion
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