Ruff fixes (#8913)

* updating DIRECTORY.md

* Fix ruff error in eulerian_path_and_circuit_for_undirected_graph.py

* Fix ruff error in newtons_second_law_of_motion.py

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Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Tianyi Zheng committed 2y ago

5cf34d901e32b65425103309bbad0068b1851238

Parent: 90a8e6e

Committed by GitHub <[email protected]> on 7/31/2023, 8:53:26 PM