text: from zipfile import ZipFile
  
  
  def extract_single_file_zip(zip_file_path, destination_directory_path):
      """
      Accepts a zip file path and destination directory path then extracts a single file from zip file
      into the desintation directory.  ZIP archive must contain one and only one file.
  
      Returns the file path of the extracted file.
      """
      with ZipFile(zip_file_path) as zip_file:
          zip_files = zip_file.namelist()
          file_count = len(zip_files)
          if file_count < 1:
              raise RuntimeError("No files found in zip archive")
          if file_count > 1:
              raise NotImplementedError("Expected no more than one file in zip archive")
          return zip_file.extract(zip_files[0], path=destination_directory_path)
  