code: def load_file(cls, file_path):
          
          with open(os.path.abspath(file_path), 'rt') as f:
              s = Sudoku(f.read().strip())
          return s
docs: Load a Sudoku from file.
  
          :param file_path: The path to the file to load_file.
          :type file_path: str, unicode
          :return: A Sudoku instance with the parsed
                   information from the file.
          :rtype: :py:class:`dlxsudoku.sudoku.Sudoku`