def get_suffix(self) -> str:
        """
        Return the string immediately following the invocant node. This is
        effectively equivalent to node.next_sibling.prefix
        """
        next_sib = self.next_sibling
        if next_sib is None:
            return ""
        prefix = next_sib.prefix
        return prefix

        Return the string immediately following the invocant node. This is
        effectively equivalent to node.next_sibling.prefix
        
src/blib2to3/pytree.py