The correct choice is the snippet that uses try and except UnicodeDecodeError, logging a warning and allowing the script to continue. This works because UnicodeDecodeError is a subclass of ValueError, raised specifically when a file contains bytes that cannot be decoded according to the expected encoding—such as invalid UTF-8 sequences. By catching only this exception, the developer isolates the encoding failure without halting the entire process, which is exactly what the requirement demands. On the Certified Associate Python Programmer PCAP exam, this tests your understanding of exception hierarchy and targeted handling; a common trap is catching a broad Exception or ValueError, which would mask unrelated errors. To remember: think of UnicodeDecodeError as a “skip signal” for encoding mismatches—catch it narrowly, log it, and move on. A useful mnemonic is “Decode, Don’t Drown”—catch the specific error, not the whole ocean.
PCAP Exceptions and File I/O Practice Question
This PCAP practice question tests your understanding of exceptions and file i/o. 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 developer is writing a script that processes user-uploaded CSV files. The script should attempt to read the file, and if a UnicodeDecodeError occurs, log a warning and skip the file. Which code snippet correctly achieves this without stopping the entire process?
Option B is correct because it catches only UnicodeDecodeError, which is the specific exception raised when a file contains invalid UTF-8 or other encoding issues. It logs a warning and then continues execution (the 'pass' is implied by the log statement, but the key is that the exception is handled without re-raising). This matches the requirement to skip the file without stopping the entire process.
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.
UnicodeEncodeError occurs during encoding, not decoding; wrong exception.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the distinction between UnicodeDecodeError (input decoding) and UnicodeEncodeError (output encoding), and the trap here is that candidates confuse the two or use an overly broad except clause that hides bugs.
Detailed technical explanation
How to think about this question
UnicodeDecodeError is a subclass of ValueError and occurs when the codec used to decode bytes into a string fails (e.g., UTF-8 codec encountering invalid byte sequences). In real-world CSV processing, files may come from different locales or be corrupted; catching only this specific exception allows the script to log and skip problematic files while still letting other unexpected errors (like FileNotFoundError) propagate for proper debugging.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Exceptions and File I/O — This question tests Exceptions and File I/O — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: try: read_file() except UnicodeDecodeError: log.warning('Skipping file') — Option B is correct because it catches only UnicodeDecodeError, which is the specific exception raised when a file contains invalid UTF-8 or other encoding issues. It logs a warning and then continues execution (the 'pass' is implied by the log statement, but the key is that the exception is handled without re-raising). This matches the requirement to skip the file without stopping the entire process.
What should I do if I get this PCAP 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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Question Discussion
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