polars.LazyFrame.columns#

property LazyFrame.columns: list[str][source]#

Get the column names.

Returns:

list of str: A list containing the name of each column in order.

Warning

Determining the column names of a LazyFrame requires resolving its schema, which is a potentially expensive operation. Using collect_schema() is the idiomatic way of resolving the schema. This property exists only for symmetry with the DataFrame class.

See also

collect_schema
Schema.names

Examples

>>> lf = pl.LazyFrame(
...     {
...         "foo": [1, 2, 3],
...         "bar": [6, 7, 8],
...         "ham": ["a", "b", "c"],
...     }
... ).select("foo", "bar")
>>> lf.columns  
['foo', 'bar']