code: def get_dataset_files(self, dataset_id, glob=".", is_dir=False, version_number=None):
          
          if version_number is None:
              latest = True
          else:
              latest = False
  
          data = {
              "download_request": {
                  "glob": glob,
                  "isDir": is_dir,
                  "latest": latest
              }
          }
  
          failure_message = "Failed to get matched files in dataset {}".format(dataset_id)
  
          versions = self._get_success_json(self._post_json(routes.matched_files(dataset_id), data, failure_message=failure_message))['versions']
  
          # if you don't provide a version number, only the latest
          # will be included in the response body
          if version_number is None:
              version = versions[0]
          else:
              try:
                  version = list(filter(lambda v: v['number'] == version_number, versions))[0]
              except IndexError:
                  raise ResourceNotFoundException()
  
          return list(
              map(
                  lambda f: DatasetFile(path=f['filename'], url=f['url']), version['files']
                  )
              )
docs: Retrieves URLs for the files matched by a glob or a path to a directory
          in a given dataset.
  
          :param dataset_id: The id of the dataset to retrieve files from
          :type dataset_id: int
          :param glob: A regex used to select one or more files in the dataset
          :type glob: str
          :param is_dir: Whether or not the supplied pattern should be treated as a directory to search in
          :type is_dir: bool
          :param version_number: The version number of the dataset to retrieve files from
          :type version_number: int
          :return: A list of dataset files whose paths match the provided pattern.
          :rtype: list of :class:`DatasetFile`