polars.Expr.name.prefix_fields#
- Expr.name.prefix_fields(prefix: str) Expr [source]#
Add a prefix to all field names of a struct.
- Parameters:
- prefix
Prefix to add to the field name.
See also
Notes
This only takes effect for struct columns.
Examples
>>> df = pl.DataFrame({"x": {"a": 1, "b": 2}}) >>> df.select(pl.col("x").name.prefix_fields("prefix_")).schema Schema({'x': Struct({'prefix_a': Int64, 'prefix_b': Int64})})