polars.api.register_series_namespace#

polars.api.register_series_namespace(name: str) → Callable[[type[NS]], type[NS]][source]#

Decorator for registering custom functionality with a polars Series.

Parameters:

name: Name under which the functionality will be accessed.

See also

register_expr_namespace: Register functionality on an Expr.
register_dataframe_namespace: Register functionality on a DataFrame.
register_lazyframe_namespace: Register functionality on a LazyFrame.

Examples

>>> @pl.api.register_series_namespace("math")
... class MathShortcuts:
...     def __init__(self, s: pl.Series):
...         self._s = s
...
...     def square(self) -> pl.Series:
...         return self._s * self._s
...
...     def cube(self) -> pl.Series:
...         return self._s * self._s * self._s
...
>>>
>>> s = pl.Series("n", [1.5, 31.0, 42.0, 64.5])
>>> s.math.square().alias("s^2")
shape: (4,)
Series: 's^2' [f64]
[
    2.25
    961.0
    1764.0
    4160.25
]
>>> s = pl.Series("n", [1, 2, 3, 4, 5])
>>> s.math.cube().alias("s^3")
shape: (5,)
Series: 's^3' [i64]
[
    1
    8
    27
    64
    125
]