code: def absolute_path(user_path):
      
      if os.path.abspath(user_path):
          return unix_path_coercion(user_path)
      else:
          try:
              openaccess_epub.utils.evaluate_relative_path(relative=user_path)
          except:
              raise ValidationError('This path could not be rendered as absolute')
docs: Some paths must be made absolute, this will attempt to convert them.