BUG: Let CategoricalIndex take CategoricalDtype as dtype argument by topper-123 · Pull Request #18116 · pandas-dev/pandas (original) (raw)

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The message is "Cannot specify both dtype and categories or ordered." in both cases.

FYI, pytest can now take a parameter match which does the same thing (i.e. with pytest.raises(ValueError, match="Cannot specify both `dtype` and `categories` or `ordered`." ):). This is a new feature added in pytest 3.1, so its very new. Pandas doesn't seem to have a minimum specified version of pytest, but it's reasonable to be able to test pandas with version < 3.1 of pytest, though.