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>

project_euler/problem_03/sol1.py

@@ -50,7 +50,7 @@ def solution(n):
     """
     try:
         n = int(n)
-    except (TypeError, ValueError) as e:
+    except (TypeError, ValueError):
         raise TypeError("Parameter n must be int or passive of cast to int.")
     if n <= 0:
         raise ValueError("Parameter n must be greater or equal to one.")