Clean Code: Apply flake8-simplify to Python

Also flake8-comprehensions which was added to the CI

For flake8-simplify, there are a few false-positives,
e.g. https://github.com/MartinThoma/flake8-simplify/issues/115

90_Tower/python/tower.py

@@ -91,8 +91,7 @@ class Game:
         w = int(input("WHICH DISK WOULD YOU LIKE TO MOVE\n"))
         if w in self.__sizes:
             return w
-        else:
-            raise Exception()
+        raise Exception()
 
     def pick_disk(self):
         which = None