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      Question

      In pandas, what does df.groupby('A').agg({'B': 'sum',

      'C': 'mean'}) return?
      A A DataFrame with aggregated columns B and C by groups of A. Correct Answer Incorrect Answer
      B A Series indexed by A with tuple values. Correct Answer Incorrect Answer
      C Raises an error due to mixed aggregations. Correct Answer Incorrect Answer
      D A list of DataFrames. Correct Answer Incorrect Answer
      E A pivot table that loses grouping index. Correct Answer Incorrect Answer

      Solution

      .groupby(...).agg({...}) returns a DataFrame indexed by group keys with specified aggregated columns.

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