class_docstr: Wraps s3fs Dask filesystem implementation like s3fs, gcsfs, etc.
code: def isfile(self, path):
      raise NotImplementedError("Unsupported file system API")
  
imports: import os
  import posixpath
  import sys
  import urllib.parse
  import warnings
  from os.path import join
  import pyarrow
  from pyarrow.util import doc, _stringify_path, _is_path_like, _DEPR_MSG
label_desc: Use image node_id 3 for calling the DaskFileSystem obj's underlying member method code with example usage: obj.isfile(path) without return types