pandas.Series.drop_duplicates
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Series.drop_duplicates(keep='first', inplace=False)[source]
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Return Series with duplicate values removed Parameters: keep : {‘first’, ‘last’, False}, default ‘first’ - 
first: Drop duplicates except for the first occurrence.
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last: Drop duplicates except for the last occurrence.
- False : Drop all duplicates.
 inplace : boolean, default False If True, performs operation inplace and returns None. Returns: deduplicated : Series 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.Series.drop_duplicates.html