class_docstr: A dataframe object backed by a Polars DataFrame.
  
  Parameters
  ----------
  column
      The Polars DataFrame backing the dataframe object.
  allow_copy
      Allow data to be copied during operations on this column. If set to `False`,
      a RuntimeError is raised if data would be copied.
docstr: Return the column names.
docstr_tok: ["Return","the","column","names","."]
code: def column_names(self) -> list[str]:
      """Return the column names."""
      return self._df.columns
  
imports: from __future__ import annotations
  from collections.abc import Sequence
  from itertools import accumulate
  from typing import TYPE_CHECKING
  from polars.interchange.column import PolarsColumn
  from polars.interchange.protocol import CopyNotAllowedError
  from polars.interchange.protocol import DataFrame
label_desc: Use image node_id 7 for calling the PolarsDataFrame obj's underlying member method code with example usage: obj.column_names() and returns: self