Python Interview Questions · interview question
In Python, which comparison about Mutable Default Arguments is accurate?
Multiple choiceEasypython-interview-2026interviewpythoncomparison
Answer and explanation
Correct answer
C. An immutable default such as None is usually a safe placeholder, while a mutable default such as [] can leak state across calls.
Why
An immutable default such as None is usually a safe placeholder, while a mutable default such as [] can leak state across calls. This is the comparison that usually separates memorization from understanding.
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