DOC: clarify pandas.unique return type#65638
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Spell out the three return-type cases by dispatch path: Index input returns an Index, ExtensionDtype input returns an ExtensionArray of the same dtype, and any other input returns numpy.ndarray. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
mroeschke
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May 16, 2026
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Thanks @jbrockmendel |
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closes #47426
Summary
Returnssection ofpandas.uniqueto spell out the three actual dispatch paths inunique_with_mask:Indexinput →Index,ExtensionDtypeinput →ExtensionArrayof same dtype, everything else →numpy.ndarray.Categoricalfor the EA case, claimed Series/ndarray always returns ndarray (misleading for EA-backed Series), and ended with a redundant trailing line.Test plan
pd.uniquedoctests still pass