This PCAP practice question tests your understanding of modules and packages. 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 project uses namespace packages spread across multiple directories. The package structure is: project/ and lib/ both contain subdirectories 'mypkg/'. Each has an __init__.py file. When importing 'mypkg', which directory's contents are used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Only the directory that appears first in sys.path is used.
When both directories contain an __init__.py file, they are regular packages, not namespace packages. Python's import system uses the first match in sys.path; it does not merge regular packages. Therefore, only the directory that appears first in sys.path is used, making option B correct.
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.
✗
Both directories are merged into a single namespace package.
Why it's wrong here
Namespace packages require no __init__.py; these have it, so they are regular packages.
✓
Only the directory that appears first in sys.path is used.
Why this is correct
Python's import system uses the first matching location.
Related concept
Read the scenario before looking for a memorised answer.
✗
An error is raised due to ambiguous import.
Why it's wrong here
No error; Python silently uses the first one.
✗
The last directory in sys.path overrides the previous.
Why it's wrong here
First found is used, not last.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse regular packages (with __init__.py) with namespace packages (without __init__.py), assuming Python merges both regardless, when in fact the presence of __init__.py prevents merging and triggers first-found-wins behavior.
Detailed technical explanation
How to think about this question
Under the hood, Python's import machinery iterates through sys.path in order and stops at the first directory containing a subdirectory named 'mypkg' with an __init__.py file. This behavior is defined in PEP 420 for namespace packages, but explicitly requires the absence of __init__.py to trigger merging. In real-world scenarios, this can cause subtle bugs when a developer accidentally leaves an __init__.py in a directory intended to be a namespace package, leading to only one package being loaded instead of the combined contents.
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 — 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: Only the directory that appears first in sys.path is used. — When both directories contain an __init__.py file, they are regular packages, not namespace packages. Python's import system uses the first match in sys.path; it does not merge regular packages. Therefore, only the directory that appears first in sys.path is used, making option B correct.
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.
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 →
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.
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.