- A
The user did not restart the Python interpreter, so sys.modules still contains the old module.
Why wrong: The description says the user restarted the application.
- B
The import statement in __init__.py is cached, so the module is not reloaded even after update.
Why wrong: The import itself is executed each time the library is imported, but if the .pyc file is stale, the code inside is old.
- C
The library's .pyc files were not regenerated because the .py timestamps were not updated during the install, so Python used the cached bytecode from the previous version.
If the .py file's modification time is not newer than the .pyc file, Python uses the bytecode.
- D
The config module caches the configuration file contents in memory after the first read.
Why wrong: This would be a bug in the library itself, but the issue is about the library update not reflecting.
Quick Answer
The answer is that stale .pyc files caused the old code to execute because Python’s bytecode cache was not invalidated. When Python imports a module, it checks the modification timestamp of the .py file against its compiled .pyc counterpart; if the .pyc is newer or the .py timestamp wasn’t updated during installation, Python skips recompilation and loads the cached bytecode. This means the old version of the config submodule—with its outdated configuration-reading logic—remains in use, even though the config file on disk has been changed. On the PCAP exam, this tests your understanding of Python’s import system and bytecode caching, a common trap where candidates assume a file change guarantees code refresh. Remember the key rule: Python trusts timestamps, not content. A helpful mnemonic is “pyc before py? Old code will fly”—if the cached bytecode appears newer than the source, Python will use the stale version.
PCAP Modules and Packages Practice Question
This PCAP practice question tests your understanding of modules and packages. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You maintain a Python library 'myutils' that is installed as a package in the system. The library has a submodule 'config' that reads configuration from a file. Recently, a user reported that after updating the library, their application still uses the old configuration values. They confirmed that the config file on disk has been updated. The library's __init__.py does: from .config import load_config. The user's application imports load_config from myutils and calls it each time they need configuration. What is the most likely cause of the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The library's .pyc files were not regenerated because the .py timestamps were not updated during the install, so Python used the cached bytecode from the previous version.
Option C is correct because Python caches compiled bytecode in .pyc files. If the .pyc file's timestamp is newer than the corresponding .py file, Python will use the cached bytecode without recompiling. During a package update, if the .py files' timestamps are not updated (e.g., due to a flawed installation process), Python continues to load the old .pyc, causing the old configuration-reading code to execute even though the config file on disk has changed.
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.
- ✗
The user did not restart the Python interpreter, so sys.modules still contains the old module.
Why it's wrong here
The description says the user restarted the application.
- ✗
The import statement in __init__.py is cached, so the module is not reloaded even after update.
Why it's wrong here
The import itself is executed each time the library is imported, but if the .pyc file is stale, the code inside is old.
- ✓
The library's .pyc files were not regenerated because the .py timestamps were not updated during the install, so Python used the cached bytecode from the previous version.
Why this is correct
If the .py file's modification time is not newer than the .pyc file, Python uses the bytecode.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The config module caches the configuration file contents in memory after the first read.
Why it's wrong here
This would be a bug in the library itself, but the issue is about the library update not reflecting.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the misconception that Python always recompiles .pyc files when the source changes, but the trap is that Python relies on file timestamps, not content hashes, so a stale .pyc can persist if the .py timestamp is not updated during installation.
Detailed technical explanation
How to think about this question
Python's import mechanism checks the modification time of the .py file against the .pyc file; if the .pyc is newer, it skips recompilation. This can lead to silent use of old bytecode if an installer (e.g., pip with --no-compile or a manual copy) does not update timestamps properly. In real-world scenarios, this often manifests after a library upgrade when the user forgets to delete __pycache__ directories or the installation process fails to refresh .pyc files.
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.
- →
Modules and Packages — study guide chapter
Learn the concepts, then practise the questions
- →
Modules and Packages practice questions
Targeted practice on this topic area only
- →
All PCAP questions
511 questions across all exam domains
- →
Certified Associate Python Programmer PCAP study guide
Full concept coverage aligned to exam objectives
- →
PCAP practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related PCAP practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Modules and Packages practice questions
Practise PCAP questions linked to Modules and Packages.
Strings practice questions
Practise PCAP questions linked to Strings.
Object-Oriented Programming practice questions
Practise PCAP questions linked to Object-Oriented Programming.
Exceptions and File I/O practice questions
Practise PCAP questions linked to Exceptions and File I/O.
PCAP fundamentals practice questions
Practise PCAP questions linked to PCAP fundamentals.
PCAP scenario practice questions
Practise PCAP questions linked to PCAP scenario.
PCAP troubleshooting practice questions
Practise PCAP questions linked to PCAP troubleshooting.
Practice this exam
Start a free PCAP practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this PCAP question test?
Modules and Packages — This question tests Modules and Packages — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The library's .pyc files were not regenerated because the .py timestamps were not updated during the install, so Python used the cached bytecode from the previous version. — Option C is correct because Python caches compiled bytecode in .pyc files. If the .pyc file's timestamp is newer than the corresponding .py file, Python will use the cached bytecode without recompiling. During a package update, if the .py files' timestamps are not updated (e.g., due to a flawed installation process), Python continues to load the old .pyc, causing the old configuration-reading code to execute even though the config file on disk has changed.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 30, 2026
This PCAP 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 PCAP exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.