pandas.api.extensions.ExtensionArray.duplicated — pandas 2.2.3 documentation (original) (raw)

ExtensionArray.duplicated(keep='first')[source]#

Return boolean ndarray denoting duplicate values.

Parameters:

keep{‘first’, ‘last’, False}, default ‘first’

• first : Mark duplicates as True except for the first occurrence.
• last : Mark duplicates as True except for the last occurrence.
• False : Mark all duplicates as True.

Returns:

ndarray[bool]

Examples

pd.array([1, 1, 2, 3, 3], dtype="Int64").duplicated() array([False, True, False, False, True])