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. Resolving the schema of a LazyFrame can be an expensive operation. Avoid accessing this property repeatedly if possible.

Examples

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