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 has the following directory structure:
Inside 'module.py', there is a function 'func' that needs to be imported in 'main.py'. The team wants to import 'func' using a relative import from 'main.py'. However, when they run 'python main.py' from the project root, they get an ImportError. What is the most likely reason?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Relative imports cannot be used in scripts executed directly as __main__.
Option C is correct because when a Python script is executed directly (e.g., `python main.py`), its `__name__` is set to `"__main__"`, not the package name. Relative imports (e.g., `from .subpackage.module import func`) rely on the `__package__` attribute being set to the package hierarchy, which only happens when the module is imported as part of a package. Since `main.py` is run as the top-level script, it has no package context, causing an `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 'project' directory does not contain an __init__.py file.
Why it's wrong here
The directory structure shows it does.
✗
The function 'func' is not defined as a public function.
Why it's wrong here
No concept of private/public in Python; all functions are importable.
✓
Relative imports cannot be used in scripts executed directly as __main__.
Why this is correct
Relative imports require the module to be part of a package with __package__ set.
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 name 'module.py' contains a hyphen.
Why it's wrong here
No hyphen.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Python Institute often tests the distinction between running a script directly (`python main.py`) versus running it as a module (`python -m package.main`), and candidates mistakenly think that adding `__init__.py` files or using absolute imports will fix the relative import error.
Trap categories for this question
Command / output trap
The directory structure shows it does.
Detailed technical explanation
How to think about this question
Relative imports use the `__package__` attribute to resolve the import path. When a script is run directly, `__package__` is set to `None` (or an empty string), so Python cannot resolve the leading dot in `from .subpackage import ...`. To use relative imports, the script must be run as a module using the `-m` flag (e.g., `python -m project.main`), which sets `__package__` correctly. This behavior is defined in PEP 328 and is a common source of confusion for developers transitioning from absolute imports.
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: Relative imports cannot be used in scripts executed directly as __main__. — Option C is correct because when a Python script is executed directly (e.g., `python main.py`), its `__name__` is set to `"__main__"`, not the package name. Relative imports (e.g., `from .subpackage.module import func`) rely on the `__package__` attribute being set to the package hierarchy, which only happens when the module is imported as part of a package. Since `main.py` is run as the top-level script, it has no package context, causing an `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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Question Discussion
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