Quiz · 4 questions

🔢 Frames — NumPy + Pandas Core

Arrays, DataFrames, and the mental shift from loops to vectorization.

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01Why does NumPy's ndarray outperform a Python list for numerical work?

02In Pandas 3.0+, what's the safe way to assign a value to a subset of rows?

03Which merge() argument helps catch a silent one-to-many fan-out where the right table has duplicate keys?

04What does GroupBy transform return, compared to GroupBy aggregate?

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