Inflect a filename to indicate its type.

        If the file is a directory, the suffix "/" is appended, otherwise
        a space is appended.

        :param filename: the name of the file to inflect

def inflect(self, filename):
        """Inflect a filename to indicate its type.

        If the file is a directory, the suffix "/" is appended, otherwise
        a space is appended.

        :param filename: the name of the file to inflect
        """
        suffix = ("/" if os.path.isdir(filename) else " ")
        return self._escape(filename) + suffix