pandas.Index.drop_duplicates¶
-
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: - deduplicated : Index
See also
Series.drop_duplicates
- equivalent method on Series
DataFrame.drop_duplicates
- equivalent method on DataFrame
Index.duplicated
- related method on Index, indicating duplicate Index values.
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')