polars.Expr.str.to_uppercase

Expr.str.to_uppercase() → Expr

Modify strings to their uppercase equivalent.

Examples

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