polars.Series.is_first_distinct

Series.is_first_distinct() → Series

Return a boolean mask indicating the first occurrence of each distinct value.

Returns:

Series

Series of data type Boolean.

Examples

>>> s = pl.Series([1, 1, 2, 3, 2])
>>> s.is_first_distinct()
shape: (5,)
Series: '' [bool]
[
    true
    false
    true
    true
    false
]