code: def get_dataset_file(self, dataset_id, file_path, version = None):
          
          return self.get_dataset_files(dataset_id, "^{}$".format(file_path), version_number=version)[0]
docs: Retrieves a dataset file matching a provided file path
  
          :param dataset_id: The id of the dataset to retrieve file from
          :type dataset_id: int
          :param file_path: The file path within the dataset
          :type file_path: str
          :param version: The dataset version to look for the file in. If nothing is supplied, the latest dataset version will be searched
          :type version: int
          :return: A dataset file matching the filepath provided
          :rtype: :class:`DatasetFile`