Tighten up psf/black and flake8 (#2024)

* Tighten up psf/black and flake8

* Fix some tests

* Fix some E741

* Fix some E741

* updating DIRECTORY.md

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

other/dijkstra_bankers_algorithm.py

@@ -145,7 +145,7 @@ class BankersAlgorithm:
         Process 5 is executing.
         Updated available resource stack for processes: 8 5 9 7
         The process is in a safe state.
-        <BLANKLINE>                            
+        <BLANKLINE>
         """
         need_list = self.__need()
         alloc_resources_table = self.__allocated_resources_table