polars.DataFrame.columns#

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

Get or set column names.

Examples

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

Set column names:

>>> df.columns = ["apple", "banana", "orange"]
>>> df
shape: (3, 3)
┌───────┬────────┬────────┐
│ apple ┆ banana ┆ orange │
│ ---   ┆ ---    ┆ ---    │
│ i64   ┆ i64    ┆ str    │
╞═══════╪════════╪════════╡
│ 1     ┆ 6      ┆ a      │
├╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┤
│ 2     ┆ 7      ┆ b      │
├╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┼╌╌╌╌╌╌╌╌┤
│ 3     ┆ 8      ┆ c      │
└───────┴────────┴────────┘