polars.field

polars.field(name: str | list[str]) → Expr

Select a field in the current struct.with_fields scope.

Parameters:

name

Name of the field(s) to select.

Examples

>>> df = pl.DataFrame({"a": [{"x": 5, "y": 2}, {"x": 3, "y": 4}]})
>>> df.select(pl.col("a").struct.with_fields(pl.field("x") ** 2))
shape: (2, 1)
┌───────────┐
│ a         │
│ ---       │
│ struct[2] │
╞═══════════╡
│ {25,2}    │
│ {9,4}     │
└───────────┘