What is the primary purpose of calling the close() method on a file object?

To delete the file from the filesystem

To release system resources associated with the file

To save the file to a different location

A developer needs to read the first 5 lines of a large log file for a quick preview. The file is too large to load entirely into memory. Which approach reads exactly the first 5 lines efficiently?

lines = [f.readline() for _ in range(5)]

lines = f.read().split('\n')[:5]

Python InstitutePCAP - Certified Associate Python Programmer

Domain 5Objective 5

PCAP-31-03 5.5 Perform Input/output Operations PCAP-31 Practice Questions (Page 2)

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 21 practice questions to prepare you well beyond it. (estimate)

21questions here

5free pages

8concepts

22%of the exam

Questions 6–10

6foundation · easy
Which open() mode string should be used to read a binary file such as an image?
Select an answer first
7application · medium
A developer is writing a script that generates a report. The script writes several sections to a file. After writing all sections, the developer wants to ensure the data is physically written to disk before the script continues to the next phase. What should the developer do?
Select an answer first
8foundation · easy
Which errno constant is typically raised when a file exists but the current user does not have permission to open it?
Select an answer first
9foundation · easy
What is the primary purpose of calling the close() method on a file object?
Select an answer first
10application · medium
A developer needs to read the first 5 lines of a large log file for a quick preview. The file is too large to load entirely into memory. Which approach reads exactly the first 5 lines efficiently?
Select an answer first

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PCAP-31-03 5.5 Perform Input/output Operations PCAP-31 Practice Questions (Page 2)

Questions 6–10

Which open() mode string should be used to read a binary file such as an image?

A developer is writing a script that generates a report. The script writes several sections to a file. After writing all sections, the developer wants to ensure the data is physically written to disk before the script continues to the next phase. What should the developer do?

Which errno constant is typically raised when a file exists but the current user does not have permission to open it?

What is the primary purpose of calling the close() method on a file object?

A developer needs to read the first 5 lines of a large log file for a quick preview. The file is too large to load entirely into memory. Which approach reads exactly the first 5 lines efficiently?

Keep studying — Miscellaneous (List Comprehensions, Lambdas, Closures, I/O)