
* singly_linked_list.py: psf/black * updating DIRECTORY.md * Update singly_linked_list.py Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
* singly_linked_list.py: psf/black * updating DIRECTORY.md * Update singly_linked_list.py Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>