raise error on slice-based selection of multi-index levels#11168
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dcherian merged 1 commit intopydata:mainfrom Feb 13, 2026
Merged
raise error on slice-based selection of multi-index levels#11168dcherian merged 1 commit intopydata:mainfrom
dcherian merged 1 commit intopydata:mainfrom
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previously, calling .sel(level=slice(...)) on a multi-index level would silently produce wrong results by passing the slice directly to pandas get_loc_level, which interprets it as a range query on that level alone. now raises a ValueError with a clear message instead. closes pydata#10534
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Co-authored-by: Claude <noreply@anthropic.com>
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Fixes #10534.
.sel(level=slice(...))on a multi-index level was silently returning wrong results — the slice got passed straight to pandasget_loc_level, which interpreted it as a range query on just that one level. Depending on the data, this either returns garbage results or an unhelpful KeyError.Now it raises a
ValueErrorwith a message pointing the user to use scalar values instead. Added a test covering both cases.