pandas.DatetimeIndex.duplicated
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DatetimeIndex.duplicated(keep='first')[source]
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Return boolean np.ndarray denoting duplicate values Parameters: keep : {‘first’, ‘last’, False}, default ‘first’ - 
first: Mark duplicates asTrueexcept for the first occurrence.
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last: Mark duplicates asTrueexcept for the last occurrence.
- False : Mark all duplicates as True.
 Returns: duplicated : np.ndarray 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.DatetimeIndex.duplicated.html