Quick Answer
The correct answer is to use a with statement to open the file. This is the Python best practice for file handling because the with statement acts as a context manager, guaranteeing that the file is automatically closed when the block of code finishes executing, even if an exception occurs. Without it, buffered data might not be flushed to disk, risking data loss or corruption. On the Certified Entry-Level Python Programmer PCEP exam, this concept tests your understanding of resource management and safe I/O operations; a common trap is assuming that calling f.close() manually is sufficient, but if an error interrupts the script before that line, the file remains open. Remember the mnemonic: “with it, you’re never left hanging” — the context manager handles cleanup for you, ensuring data integrity every time.
This PCEP practice question tests your understanding of computer programming and python fundamentals. 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.
A Python script uses the following code to open a file: f = open('data.txt', 'w'). The programmer then writes multiple lines to the file. After writing, which of the following is the BEST practice to ensure data integrity?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Call f.close() after writing.
Why wrong: Works but not exception-safe.
Call f.flush() after writing.
Why wrong: Flushes buffer but does not close file.
No action needed; Python automatically closes files.
Why wrong: Not guaranteed; depends on garbage collection.
Use a with statement to open the file.
Ensures proper closing even on exceptions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use a with statement to open the file.
Option D is correct because using a `with` statement ensures that the file is automatically closed when the block exits, even if an exception occurs. This guarantees that all buffered data is flushed to disk, preventing data loss or corruption. It is the recommended best practice in Python for reliable file handling.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Call f.close() after writing.
Why it's wrong here
Works but not exception-safe.
Call f.flush() after writing.
Why it's wrong here
Flushes buffer but does not close file.
No action needed; Python automatically closes files.
Why it's wrong here
Not guaranteed; depends on garbage collection.
Use a with statement to open the file.
Why this is correct
Ensures proper closing even on exceptions.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Python Institute often tests the misconception that Python automatically closes files or that calling `close()` or `flush()` individually is sufficient, when in fact the `with` statement is the only guaranteed way to ensure proper cleanup and data integrity.
Detailed technical explanation
The `with` statement uses the context manager protocol, calling `__enter__` on the file object and `__exit__` when the block ends, which internally invokes `close()`. This ensures that even if an exception occurs, the file is properly closed and buffered data is flushed. In contrast, relying on `f.close()` or `f.flush()` can leave data in the OS buffer if the program crashes, while Python's automatic garbage collection is non-deterministic and may not close the file promptly.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Computer Programming and Python Fundamentals — This question tests Computer Programming and Python Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: Use a with statement to open the file. — Option D is correct because using a `with` statement ensures that the file is automatically closed when the block exits, even if an exception occurs. This guarantees that all buffered data is flushed to disk, preventing data loss or corruption. It is the recommended best practice in Python for reliable file handling.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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.
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