daft.Expression.str.startswith#
- Expression.str.startswith(prefix: str | daft.expressions.expressions.Expression) Expression[source]#
Checks whether each string starts with the given pattern in a string column
Example
>>> import daft >>> df = daft.from_pydict({"x": ["geftdaft", "lazy", "daft.io"]}) >>> df.with_column("match", df["x"].str.startswith("daft")).collect() ╭──────────┬─────────╮ │ x ┆ match │ │ --- ┆ --- │ │ Utf8 ┆ Boolean │ ╞══════════╪═════════╡ │ geftdaft ┆ false │ ├╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┤ │ lazy ┆ false │ ├╌╌╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌╌┤ │ daft.io ┆ true │ ╰──────────┴─────────╯ (Showing first 3 of 3 rows)
- Parameters:
pattern – pattern to search for as a literal string, or as a column to pick values from
- Returns:
a Boolean expression indicating whether each value starts with the provided pattern
- Return type:
Expression