code: def add_path_column(df, column_name, path, dtype):
      if column_name in df.columns:
          raise ValueError(
              f"Files already contain the column name: '{column_name}', so the path "
              "column cannot use this name. Please set `include_path_column` to a "
              "unique name."
          )
      return df.assign(
          **{column_name: pd.Series([path] * len(df), dtype=dtype)}
      )
  
imports: from __future__ import annotations
  import io
  import os
  from functools import partial
  from itertools import zip_longest
  import pandas
  from fsspec.core import open_files
  from dask.base import compute
  from dask.bytes import read_bytes
  from dask.core import flatten
  from dask.dataframe._compat import PANDAS_GE_200, PANDAS_VERSION
  from dask.dataframe.backends import dataframe_creation_dispatch
  from dask.dataframe.io.io import from_delayed
  from dask.dataframe.utils import insert_meta_param_description, make_meta
  from dask.delayed import delayed
label_desc: Use image node_id 6 for calling a global function with example usage: add_path_column(df, column_name, path, dtype) and returns: df