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.
A Python script fails with 'ModuleNotFoundError: No module named 'myapp.config''. The environment variable PYTHONPATH is not set. Which of the following is the most likely cause?
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.
The module is located in a directory not included in sys.path
Correct. Python only searches directories in sys.path for modules.
B
The module's __init__.py is missing
Why wrong: Missing __init__.py might prevent recognition as a package, but Python 3.3+ can still import modules from directories without __init__.py as namespace packages; the error message would be different.
C
The module is installed in a different Python version's site-packages
Why wrong: This could cause issues, but the more direct cause is the directory not being in sys.path.
D
The module has a syntax error
Why wrong: A syntax error would raise a SyntaxError, not ModuleNotFoundError.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The module is located in a directory not included in sys.path
When PYTHONPATH is not set, Python relies solely on sys.path to locate modules. sys.path includes the script's directory, standard library paths, and site-packages. If 'myapp.config' is not in any of these directories, Python raises ModuleNotFoundError. Option A correctly identifies that the module is in a directory not included in sys.path.
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 module is located in a directory not included in sys.path
Why this is correct
Correct. Python only searches directories in sys.path for modules.
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 module's __init__.py is missing
Why it's wrong here
Missing __init__.py might prevent recognition as a package, but Python 3.3+ can still import modules from directories without __init__.py as namespace packages; the error message would be different.
✗
The module is installed in a different Python version's site-packages
Why it's wrong here
This could cause issues, but the more direct cause is the directory not being in sys.path.
✗
The module has a syntax error
Why it's wrong here
A syntax error would raise a SyntaxError, not ModuleNotFoundError.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the distinction between a module not being found (ModuleNotFoundError) versus a package structure issue (missing __init__.py) or a code error (SyntaxError), tempting candidates to pick the more specific but incorrect cause.
Detailed technical explanation
How to think about this question
Python's module search algorithm iterates through sys.path, which is initialized from the script's directory, PYTHONPATH environment variable, and installation-dependent defaults. The 'myapp.config' module could be a subpackage within a package not on sys.path, or a standalone module in a directory not listed. In real-world scenarios, this often occurs when developers forget to add the project root to PYTHONPATH or fail to install the package in editable mode (pip install -e .).
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: The module is located in a directory not included in sys.path — When PYTHONPATH is not set, Python relies solely on sys.path to locate modules. sys.path includes the script's directory, standard library paths, and site-packages. If 'myapp.config' is not in any of these directories, Python raises ModuleNotFoundError. Option A correctly identifies that the module is in a directory not included in sys.path.
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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Question Discussion
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