Quick Answer
The answer is `importlib.import_module(mod_name)`. This is the correct function because it is the standard Python mechanism to dynamically import a module by name string at runtime, accepting a string variable like `mod_name` and returning the module object for immediate use. Unlike the `__import__()` built-in, which is lower-level and often confusing, `importlib.import_module()` is the explicit, recommended tool for runtime imports, making it essential for applications that load plugins or configuration-driven code. On the Certified Associate Python Programmer PCAP exam, this question tests your understanding of dynamic imports and the `importlib` module, often appearing as a distractor where options like `__import__` or `importlib.load_module` (deprecated) are used to trip you up. A common trap is confusing `import_module` with `importlib.reload` or forgetting that the argument is a string, not a module object. Memory tip: think "import_module" as "import by string"—the function name literally tells you it imports a module, and the argument is the name as a string.
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.
An application needs to dynamically load a module whose name is provided at runtime (stored in a variable 'mod_name'). Which function from the importlib module should be used?
importlib.reload(mod_name)
Why wrong: reload() is for reloading an already imported module.
importlib.load_module(mod_name)
Why wrong: load_module() is deprecated and not recommended.
importlib.import(mod_name)
Why wrong: The function is named import_module, not import.
importlib.import_module(mod_name)
This function is designed for programmatic module loading.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
importlib.import_module(mod_name)
Option D is correct because `importlib.import_module(mod_name)` is the standard Python function designed to dynamically import a module given its name as a string at runtime. It returns the module object, allowing the application to load and use modules whose names are not known until execution.
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.
importlib.reload(mod_name)
Why it's wrong here
reload() is for reloading an already imported module.
importlib.load_module(mod_name)
Why it's wrong here
load_module() is deprecated and not recommended.
importlib.import(mod_name)
Why it's wrong here
The function is named import_module, not import.
importlib.import_module(mod_name)
Why this is correct
This function is designed for programmatic module loading.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Python Institute often tests the distinction between `importlib.import_module()` and the non-existent `importlib.import()` or the deprecated `imp.load_module()`, exploiting candidates' tendency to guess based on similar-sounding names rather than precise API knowledge.
Detailed technical explanation
Under the hood, `importlib.import_module()` uses the same import machinery as the `import` statement, invoking `__import__()` and handling package-relative imports via the `package` parameter. This function is essential for plugin systems or configuration-driven applications where module names are stored in variables or configuration files, enabling dynamic code loading without hardcoding imports.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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: importlib.import_module(mod_name) — Option D is correct because `importlib.import_module(mod_name)` is the standard Python function designed to dynamically import a module given its name as a string at runtime. It returns the module object, allowing the application to load and use modules whose names are not known until execution.
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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