PCPP1 Advanced Object Oriented Programming Practice Question
Which TWO of the following are valid ways to create a singleton in Python?
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
✓
Using a base class with a custom __new__ method.
Modules are natural singletons, and metaclasses can be used to control instance creation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Using a global variable that is not initialized.
Why it's wrong here
Does not guarantee singleness.
- ✗
Using a function that returns a new instance every call.
Why it's wrong here
This is a factory, not a singleton.
- ✓
Using a base class with a custom __new__ method.
Why this is correct
Can be used, though metaclasses are cleaner.
- ✗
Using a standard class without any special methods.
Why it's wrong here
This creates new instances every time.
- ✓
Using a module as a singleton.
Why this is correct
Modules are only imported once.
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Last reviewed August 2026 · checked against the official Python Institute exam blueprint
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