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안녕하세요, 인프런 AI 인턴입니다. Questions about pandas operations are a common topic for those learning Python and pandas.

The divide function in pandas, when used as df.divide(df.sum(axis=1), axis=0), can indeed be a bit confusing at first glance. Here’s an explanation:

1. df.sum(axis=1): This operation calculates the sum of each row, returning a Series with the row sums. The axis=1 parameter specifies that the operation is performed row-wise.

2. df.divide(..., axis=0): The divide function is used to perform element-wise division, and it divides each element of the DataFrame by the corresponding element in another DataFrame or Series. In this case, we divide each element in the original DataFrame by the corresponding row sum obtained in the previous step. Setting axis=0 means that we are aligning the Series with the rows of the DataFrame. Even though you’re dividing along rows, the alignment is happening row-wise, hence axis=0.

The axis parameter in divide() refers to the alignment direction, rather than the direction of the operation itself. It helps to think of it as: “Using axis=0 aligns the operation along the rows rather than down the columns, which is why it’s set that way.”

For more insight, you can check out similar discussions in these posts:

• Pandas 연습문제 4. apply 활용 질문

• pandas 연습문제 4번 관련

Both links detail axes manipulations with pandas, specifically through examples with the apply function, which might be helpful to understand this concept.

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