A data engineer needs to transpose a matrix represented as a list of lists. They want to use a nested comprehension. Which comprehension correctly transposes the matrix?

[[matrix[j][i] for j in range(len(matrix))] for i in range(len(matrix[0]))]

[[row[i] for row in matrix] for i in range(len(matrix[0]))]

[[row[i] for i in range(len(matrix[0]))] for row in matrix]

[[row[i] for row in matrix] for i in range(len(matrix))]

A developer is writing a list comprehension to generate a list of all even numbers from 0 to 20 that are also divisible by 4. Which of the following comprehensions correctly produce this list? Select all that apply.

[x for x in range(21) if x % 2 == 0 or x % 4 == 0]

[x for x in range(21) if x % 2 == 0 if x % 4 == 0]

[x for x in range(21) if x % 2 == 0 and x % 4 == 0]

[x for x in range(21) if x % 4 == 0]

A developer is working with a list of strings and needs to create a list of tuples, where each tuple contains the string and its length, but only for strings that contain the letter 'a'. Which comprehension achieves this?

[(s, len(s)) for s in strings if s.find('a') != -1]

[(s, len(s)) for s in strings if s.count('a') > 0]

[(s, len(s)) for s in strings if 'a' in s else None]

[(s, len(s)) for s in strings if 'a' in s]

A developer needs to generate a list of all prime numbers less than 50. They plan to use a list comprehension with a helper function is_prime(n). Which comprehension correctly uses the helper?

[n for n in range(50) if is_prime(n) is True]

[n for n in range(50) if is_prime(n) == True]

[n for n in range(2, 50) if is_prime(n)]

[n for n in range(50) if is_prime(n)]

A developer is building a list of all possible coordinates (x, y) where x and y are integers from 0 to 5, but they want to exclude coordinates where x equals y. Which comprehension correctly does this?

[(x, y) for x in range(6) for y in range(6) if x == y]

[(x, y) for x in range(6) for y in range(6) if x != y]

[(x, y) for x in range(6) for y in range(6) if x is not y]

[(x, y) for x in range(6) if x != y for y in range(6)]

Python InstitutePCAP - Certified Associate Python Programmer

Domain 5Objective 1

PCAP-31-03 5.1 Build Complex Lists Using List Comprehensions PCAP-31 Practice Questions (Page 6)

Part of the Miscellaneous (List Comprehensions, Lambdas, Closures, I/O) domain, which accounts for 22% of the PCAP-31 exam. Python Institute does not publish an official question count, but from its 65-minute exam (~25–45 total, ~6–10 in this domain), expect 1–2 from this objective — we provide 43 practice questions to prepare you well beyond it. (estimate)

43questions here

9free pages

2concepts

22%of the exam

Questions 26–30

26expert · medium
A data engineer needs to transpose a matrix represented as a list of lists. They want to use a nested comprehension. Which comprehension correctly transposes the matrix?
Select an answer first
27expert · medium · select all that apply
A developer is writing a list comprehension to generate a list of all even numbers from 0 to 20 that are also divisible by 4. Which of the following comprehensions correctly produce this list? Select all that apply.
Select an answer first
28expert · medium
A developer is working with a list of strings and needs to create a list of tuples, where each tuple contains the string and its length, but only for strings that contain the letter 'a'. Which comprehension achieves this?
Select an answer first
29expert · medium
A developer needs to generate a list of all prime numbers less than 50. They plan to use a list comprehension with a helper function is_prime(n). Which comprehension correctly uses the helper?
Select an answer first
30expert · medium
A developer is building a list of all possible coordinates (x, y) where x and y are integers from 0 to 5, but they want to exclude coordinates where x equals y. Which comprehension correctly does this?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to PCAP-31

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by Python Institute. “PCAP-31” is a trademark of its owner, used for identification only.