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pandas.Index.drop_duplicates — pandas 2.3.1 documentation

Index.drop_duplicates(*, keep='first')[source]#

Return Index with duplicate values removed.

Parameters:

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

• ‘first’ : Drop duplicates except for the first occurrence.

• ‘last’ : Drop duplicates except for the last occurrence.

• False : Drop all duplicates.

Returns:

Index

Examples

Generate an pandas.Index with duplicate values.

>>> idx = pd.Index(['lama', 'cow', 'lama', 'beetle', 'lama', 'hippo'])

The keep parameter controls which duplicate values are removed. The value ‘first’ keeps the first occurrence for each set of duplicated entries. The default value of keep is ‘first’.

>>> idx.drop_duplicates(keep='first')
Index(['lama', 'cow', 'beetle', 'hippo'], dtype='object')

The value ‘last’ keeps the last occurrence for each set of duplicated entries.

>>> idx.drop_duplicates(keep='last')
Index(['cow', 'beetle', 'lama', 'hippo'], dtype='object')

The value False discards all sets of duplicated entries.

>>> idx.drop_duplicates(keep=False)
Index(['cow', 'beetle', 'hippo'], dtype='object')

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