polars.Series.map.contains_key#

Series.map.contains_key(key: IntoExpr) → Series[source]#

Check whether every map holds key.

engine:In MemoryStreamingDistributed

Parameters:

key: Key to look up. A single value is broadcast over all maps.

Returns:

Series: Series of data type Boolean.

Examples

>>> s = pl.Series(
...     [{"a": 1, "b": 2}, {}, None], dtype=pl.Map(pl.String, pl.Int64)
... )
>>> s.map.contains_key("a")
shape: (3,)
Series: '' [bool]
[
        true
        false
        null
]