Quick Answer
The answer is 10. This is correct because the `__str__` method in Python defines how an object is represented as a readable string when passed to the `print` function. In the code, `__str__` returns `str(self.value)`, so when `print(obj)` executes, Python automatically calls this method, converting the integer `10` to the string `'10'` for output. On the Certified Associate Python Programmer PCAP exam, this question tests your understanding of object string representation and the difference between `__str__` and `__repr__`; a common trap is confusing `__str__` with `__repr__`, where `__repr__` is meant for debugging and `__str__` for end-user readability. Remember that `print()` always invokes `__str__` if defined, and if not, it falls back to `__repr__`. A handy memory tip: think of `__str__` as the "story" you tell users, while `__repr__` is the "report" for developers.
This PCAP practice question tests your understanding of object-oriented programming. 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.
class MyClass:
def __init__(self, value):
self.value = value
obj = MyClass(10)
print(obj.value)Refer to the exhibit. What is the output?
class MyClass:
def __init__(self, value):
self.value = value
obj = MyClass(10)
print(obj.value)10
Correct: value is set to 10.
Error: 'MyClass' object has no attribute 'value'
Why wrong: __init__ sets the attribute.
<__main__.MyClass object at 0x...>
Why wrong: That would be the default representation without __str__.
None
Why wrong: Not printed.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
10
Option A is correct because the code defines a `__str__` method in `MyClass` that returns the string representation of `self.value`. When `print(obj)` is called, Python automatically invokes `__str__`, which returns `'10'` (the integer `10` converted to a string). The output is therefore `10`.
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.
10
Why this is correct
Correct: value is set to 10.
Related concept
Read the scenario before looking for a memorised answer.
Error: 'MyClass' object has no attribute 'value'
Why it's wrong here
__init__ sets the attribute.
<__main__.MyClass object at 0x...>
Why it's wrong here
That would be the default representation without __str__.
None
Why it's wrong here
Not printed.
Common exam traps
Python Institute often tests the distinction between `__str__` and `__repr__`, and the trap here is that candidates assume `print(obj)` will show the default object memory address unless they notice the custom `__str__` method overrides it.
Detailed technical explanation
The `__str__` method is part of Python's data model and is called by `print()` and `str()`. It must return a string object; if it returns a non-string (e.g., an integer), Python raises a `TypeError`. In contrast, `__repr__` is used for debugging and is invoked by `repr()` or in the interactive interpreter. Overriding `__str__` is common in real-world classes to provide human-readable output, such as displaying a user's name or a product's price.
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
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FAQ
Object-Oriented Programming — This question tests Object-Oriented Programming — Read the scenario before looking for a memorised answer..
The correct answer is: 10 — Option A is correct because the code defines a `__str__` method in `MyClass` that returns the string representation of `self.value`. When `print(obj)` is called, Python automatically invokes `__str__`, which returns `'10'` (the integer `10` converted to a string). The output is therefore `10`.
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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