polars.Series.is_first_distinct#

Series.is_first_distinct() → Series[source]#

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
]