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Update graphs/depth_first_search_2.py (#3799)

- update naming style to snake_case
- add type hints
L
Lewis Tian committed
4fa8c9d4b458a29299e69cc9a2217fe31cc41ea2
Parent: aebf9bd
Committed by GitHub <noreply@github.com> on 10/29/2020, 12:35:31 AM