DOC: Warn about dtype inference with raw=True in DataFrame.apply #62384
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This PR adds a note to the DataFrame.apply docstring to warn users about dtype inference when using raw=True, addressing issue #61632. |
mroeschke
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Oct 5, 2025
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| returned value. If that value is not ``None`` but later calls return | ||
| ``None``, a ``TypeError`` may occur because NumPy infers a | ||
| non-nullable dtype. |
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| returned value. If that value is not ``None`` but later calls return | |
| ``None``, a ``TypeError`` may occur because NumPy infers a | |
| non-nullable dtype. | |
| returned value. |
Let's just keep it simple
mroeschke
reviewed
Oct 5, 2025
| If you are just applying a NumPy reduction function this will | ||
| achieve much better performance. | ||
| .. warning:: |
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| .. warning:: | |
| .. note:: |
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the dtype is inferred from the first returned value, and returning None
may cause a TypeError.