PCPP1 Advanced Object Oriented Programming Practice Question
Which THREE of the following represent common issues when using __slots__?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Subclasses must define their own __slots__ to avoid creating a __dict__.
Slots can break pickling in some cases, make multiple inheritance tricky, and prevent adding attributes dynamically.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Subclasses must define their own __slots__ to avoid creating a __dict__.
Why this is correct
Otherwise, the child gets a dictionary.
- ✓
They make it impossible to add new attributes dynamically.
Why this is correct
This is a side effect of disabling __dict__.
- ✗
They are incompatible with all decorators.
Why it's wrong here
They work fine with decorators.
- ✗
They prevent the use of multiple inheritance.
Why it's wrong here
They work with multiple inheritance, but with caveats.
- ✓
Classes with __slots__ cannot have a __dict__ by default.
Why this is correct
This is the primary constraint.
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Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Python Institute exam blueprint
This PCPP1 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 PCPP1 exam.