Update app.py

app.py

@@ -4,8 +4,9 @@ def build(size=5):
     tot = size*size
     r=0
 
-        
-    box=[b[x for x in range(size)]=b for b in range(tot)]
+    box=[] 
+    box_o=[x for x in range(size)]
+    box.append(box_o) for i in range(size)
     print(box)
     box_cent=int(tot/2)
     num_h,num_v=0,0