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Default arguments in Python are evaluated once when the function definition is executed , meaning mutations persist across subsequent function invocations.

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Aug 12, 2026

Quiz: What is the primary difference between <code>str</code> and <code>repr</code>?

… __repr__ is an unambiguous representation (ideally valid Python code) for developers.

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Aug 30, 2026

Quiz: Why are Distroless base images (e.g. `gcr.io/distroless/python3`) recommended for production container security?

Distroless images remove package managers and shell binaries, eliminating common exploitation targets.

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Aug 30, 2026

Quiz: Why are generator expressions more memory efficient than list comprehensions when processing large datasets?

Generators evaluate lazily on demand using an iterator protocol, maintaining a minimal memory footprint regardless of dataset size.

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Oct 25, 2026

Quiz: What is the role of `np.nan` in numerical NumPy arrays and how should equality with it be checked?

By IEEE 754 standards, NaN never equals NaN . You must always use np.isnan() or pd.isna() for comparison.

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