comment

darius · Jun 5, 2014 · 46f8043 · 46f8043
1 parent 9af0618
commit 46f8043
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/sturm/2048.py b/sturm/2048.py
@@ -89,6 +89,8 @@ def left(board):
         states = tuple(sliding(lo, row) for lo,row in states)
 
 def sliding(lo, row):
+    """Slide row one place leftward, leaving fixed any places left of lo.
+    Advance lo past merging or completion."""
     for i in range(lo+1, 4):
         if (row[i-1] == 0) != (row[i-1] == row[i]):
             if row[i-1] == row[i]: lo = i