auto save

snake.py

@@ -55,10 +55,10 @@ while True:
         y += 30
     position.append((x, y))
     if x==apple_x and y==apple_y:
-        a1=random.randint(1,22)
-        a2=random.randint(1,16)
-        apple_x=30*a1-30
-        apple_y=30*a2-30
+        a=random.randint(0,22)
+        b=random.randint(0,16)
+        apple_x=a*30-30
+        apple_y=b*30-30
     else:    
         position.pop(0)
     # 将背景图画上去