Tidy up explode function

day-18/day-18.py

@@ -72,13 +72,12 @@ def explode(n, lvl=0):
     (left, right) = n
     if lvl == 4 and isinstance(left, int) and isinstance(right, int):
         return True, 0, left, right
-    else:
-        res, left, l, r = explode(left, lvl+1)
+    lvl += 1
+    res, left, l, r = explode(left, lvl)
     if not res:
-            res, right, l, r = explode(right, lvl+1)
+        res, right, l, r = explode(right, lvl)
         if not res:
             return False, n, None, None
-            else:
         if l:
             if isinstance(left, int):
                 left = left + l
@@ -88,7 +87,6 @@ def explode(n, lvl=0):
                 if res:
                     l = None
         return True, (left, right), l, r
-        else:
     if r:
         if isinstance(right, int):
             right = right + r
@@ -104,7 +102,6 @@ def split(n):
     if isinstance(n, int):
         if 10 <= n:
             return True, (n // 2, (n + 1) // 2)
-        else:
         return False, n
     (left, right) = n
     res, left = split(left)