Function polars::prelude::col

pub fn col(name: &str) -> Expr

Available on crate feature lazy only.

Create a Column Expression based on a column name.

Arguments

• name - A string slice that holds the name of the column. If a column with this name does not exist when the LazyFrame is collected, an error is returned.

Examples

// select a column name
col("foo")

// select all columns by using a wildcard
col("*")

// select specific column by writing a regular expression that starts with `^` and ends with `$`
// only if regex features is activated
col("^foo.*$")