Python: Fix Flake8 E722 and E741

Additionally:

* Use functions to group blocks of code
* Use variable names (not just one character...)

35_Even_Wins/python/evenwins.py

@@ -90,7 +90,7 @@ def to_int(s):
     try:
         n = int(s)
         return True, n
-    except:
+    except Exception:
         return False, 0