Quick Answer
The correct choice is `if __name__ == '__main__':` because Python sets the built-in variable `__name__` to the string `'__main__'` only when a script is run directly, such as with `python script.py`, whereas when the same file is imported as a module, `__name__` is set to the module’s actual name. This idiom allows a single script to serve both as a reusable module and as a standalone program, executing certain code—like tests or a main function—only in the direct execution context. On the Certified Associate Python Programmer PCAP exam, this concept tests your understanding of Python’s module system and execution model; a common trap is confusing `__name__` with `__main__` as a function or forgetting the double underscores. For a quick memory tip, think of the phrase “name equals main when run, not when imported”—the double underscores on both sides are essential, and the condition is always a string comparison, never a function call.
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 script is written to be used both as a standalone program and as an imported module. Which condition should the script use to execute code only when run directly?
if __import__ == '__main__':
Why wrong: __import__ is a function, not a variable with that value.
if __name__ == '__main__':
Correctly checks if the script is the main program.
if __name__ == '__module__':
Why wrong: __name__ is never set to '__module__'.
if __file__ == 'main':
Why wrong: __file__ contains the file path, not 'main'.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
if __name__ == '__main__':
Option B is correct because Python sets the global variable `__name__` to `'__main__'` when the script is executed directly (e.g., `python script.py`). When the script is imported as a module, `__name__` is set to the module's name. The condition `if __name__ == '__main__':` is the standard Python idiom to guard code that should only run in the direct execution context.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
if __import__ == '__main__':
Why it's wrong here
__import__ is a function, not a variable with that value.
if __name__ == '__main__':
Why this is correct
Correctly checks if the script is the main program.
Related concept
Read the scenario before looking for a memorised answer.
if __name__ == '__module__':
Why it's wrong here
__name__ is never set to '__module__'.
if __file__ == 'main':
Why it's wrong here
__file__ contains the file path, not 'main'.
Common exam traps
Python Institute often tests the exact syntax `if __name__ == '__main__':` and distracts candidates with plausible-sounding but incorrect alternatives like `__import__` or `__module__`, exploiting confusion about Python's special attributes and the difference between module-level and execution-level variables.
Detailed technical explanation
When Python runs a script, the interpreter sets `__name__` in the script's global namespace to `'__main__'` before executing the code. For an imported module, `__name__` is set to the module's fully qualified name (e.g., `'mymodule'`). This mechanism allows a single file to serve both as a reusable module and as a standalone program, a pattern commonly used for testing or providing a command-line interface. A subtle behavior is that `__name__` is also set to `'__main__'` when the script is run interactively or with the `-m` flag (e.g., `python -m mymodule`), ensuring consistent behavior across invocation methods.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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
Modules and Packages — This question tests Modules and Packages — Read the scenario before looking for a memorised answer..
The correct answer is: if __name__ == '__main__': — Option B is correct because Python sets the global variable `__name__` to `'__main__'` when the script is executed directly (e.g., `python script.py`). When the script is imported as a module, `__name__` is set to the module's name. The condition `if __name__ == '__main__':` is the standard Python idiom to guard code that should only run in the direct execution context.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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