Clean Code: Python

Fix issues found by flake8-bugbear:

* Unused loop variables
* assert statements in non-test code
* mixing test code with production code
* mark one excessive test which takes ~10min to run
  as 'slow'

43_Hammurabi/python/hamurabi.py

@@ -225,7 +225,7 @@ def main():
         else:
             print("A FANTASTIC PERFORMANCE!!!  CHARLEMANGE, DISRAELI, AND")
             print("JEFFERSON COMBINED COULD NOT HAVE DONE BETTER!\n")
-        for N in range(1, 10):
+        for _ in range(1, 10):
             print("\a")
 
     print("\nSO LONG FOR NOW.\n")