BUG: raise a proper exception when str.rsplit is passed a regex and clarify the docs #62035
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mroeschke
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Aug 4, 2025
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| if pat is not None and not isinstance(pat, str): | ||
| msg = f"expected a string object, not {type(pat).__name__}" | ||
| raise TypeError(msg) |
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Can you put this in _str_rsplit for each implementation?
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Sure no problem but this exact error is raised here for the other methods so I was following the same process. See for example find.
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.Noticed this while working on pandas-dev/pandas-stubs#1278.
rsplitdoesn't accept regular expressions but was silently accepting them and producing bad results. I added a check on the type of the input and updated the documentation.