polars.Expr.str.to_lowercase

Expr.str.to_lowercase() → Expr

Transform to lowercase variant.

Examples

>>> df = pl.DataFrame({"foo": ["CAT", "DOG"]})
>>> df.with_columns(foo_lower=pl.col("foo").str.to_lowercase())
shape: (2, 2)
┌─────┬───────────┐
│ foo ┆ foo_lower │
│ --- ┆ ---       │
│ str ┆ str       │
╞═════╪═══════════╡
│ CAT ┆ cat       │
│ DOG ┆ dog       │
└─────┴───────────┘