- A
The 'external_lib' package contains a 'core' subpackage that shadows the 'core' package from mypipeline, and Python is resolving to the wrong one.
Both packages have a 'core' subpackage. Depending on sys.path order, Python might import the wrong 'core' package, causing the import of 'processor' to fail.
- B
The __init__.py file in /opt/mypipeline/core/ is missing or empty.
Why wrong: The file exists and was working before; the error is about importing 'process', not about the package itself.
- C
The import statement in run.py is incorrect; it should use 'from core.processor import process as process' or similar.
Why wrong: The import syntax is correct and was previously working.
- D
The PYTHONPATH environment variable is set incorrectly; it should include /opt/mypipeline before /opt/external_lib.
Why wrong: It does include /opt/mypipeline first, but even so, if external_lib's core is a namespace package or if there's a .pth file, it could still interfere. However, the most direct cause is the conflict.
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 are working on a Python-based data processing pipeline that runs on a Linux server. The pipeline consists of several custom packages and modules located in /opt/mypipeline. The directory structure includes:
/opt/mypipeline/ __init__.py core/ __init__.py processor.py utils/ __init__.py logger.py
The main entry point is /opt/mypipeline/run.py, which imports modules from core and utils. The pipeline is executed using the command:
python /opt/mypipeline/run.py
Recently, the system administrator added a new Python package 'external_lib' to /opt/external_lib, and updated the PYTHONPATH environment variable to include /opt/external_lib. However, after this change, the pipeline fails to start with the following error:
ImportError: cannot import name 'process' from 'core.processor' (unknown location)
You check the PYTHONPATH and find it contains:
/opt/mypipeline:/opt/external_lib
The 'core.processor' module defines a function 'process' that is imported in run.py as:
from core.processor import process
The 'core' package has an __init__.py file. The 'external_lib' package also has a subpackage named 'core' with an __init__.py. What is the most likely cause of the import error?
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 'external_lib' package contains a 'core' subpackage that shadows the 'core' package from mypipeline, and Python is resolving to the wrong one.
The most likely cause is that the 'external_lib' package contains a 'core' subpackage, which shadows the 'core' package from mypipeline. When Python resolves the import 'from core.processor import process', it searches the directories listed in PYTHONPATH in order. Since PYTHONPATH includes both /opt/mypipeline and /opt/external_lib, and the 'core' subpackage in external_lib is found first (or its presence causes a conflict), Python may resolve to the wrong 'core' package, which does not contain a 'processor' module, leading to the ImportError.
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 'external_lib' package contains a 'core' subpackage that shadows the 'core' package from mypipeline, and Python is resolving to the wrong one.
Why this is correct
Both packages have a 'core' subpackage. Depending on sys.path order, Python might import the wrong 'core' package, causing the import of 'processor' to fail.
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 __init__.py file in /opt/mypipeline/core/ is missing or empty.
Why it's wrong here
The file exists and was working before; the error is about importing 'process', not about the package itself.
- ✗
The import statement in run.py is incorrect; it should use 'from core.processor import process as process' or similar.
Why it's wrong here
The import syntax is correct and was previously working.
- ✗
The PYTHONPATH environment variable is set incorrectly; it should include /opt/mypipeline before /opt/external_lib.
Why it's wrong here
It does include /opt/mypipeline first, but even so, if external_lib's core is a namespace package or if there's a .pth file, it could still interfere. However, the most direct cause is the conflict.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the concept of package shadowing where a third-party package with the same name as a local package causes import errors, and candidates mistakenly think the issue is with PYTHONPATH order or missing __init__.py files.
Detailed technical explanation
How to think about this question
Python's import system searches for packages in sys.path, which includes directories from PYTHONPATH. When two packages with the same name exist in different locations, the first one found in sys.path is used. However, if the 'core' subpackage in external_lib is a proper package (with __init__.py), it can shadow the intended 'core' package even if its parent directory appears later in PYTHONPATH, because Python may find it via a parent package import or if the 'core' directory is directly in a path entry. This is a common issue when third-party libraries introduce namespace conflicts with existing project packages.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
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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 'external_lib' package contains a 'core' subpackage that shadows the 'core' package from mypipeline, and Python is resolving to the wrong one. — The most likely cause is that the 'external_lib' package contains a 'core' subpackage, which shadows the 'core' package from mypipeline. When Python resolves the import 'from core.processor import process', it searches the directories listed in PYTHONPATH in order. Since PYTHONPATH includes both /opt/mypipeline and /opt/external_lib, and the 'core' subpackage in external_lib is found first (or its presence causes a conflict), Python may resolve to the wrong 'core' package, which does not contain a 'processor' module, leading to the ImportError.
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.
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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.
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