From 4afcfa102e80e4282599f4fb96cc060d0a3d248c Mon Sep 17 00:00:00 2001
From: Jonathan Erlich <35579235+joerlop@users.noreply.github.com>
Date: Fri, 15 Nov 2019 14:48:21 -0500
Subject: [PATCH] Fix op_2rot function in op.py

Function should move 5th and 6th items back in the stack to the top of the stack, not copy them. Stack should remain the same size.
---
 code-ch13/op.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/code-ch13/op.py b/code-ch13/op.py
index 4e9e3831..e675c889 100644
--- a/code-ch13/op.py
+++ b/code-ch13/op.py
@@ -285,7 +285,7 @@ def op_2over(stack):
 def op_2rot(stack):
     if len(stack) < 6:
         return False
-    stack.extend(stack[-6:-4])
+    stack[-6:] = stack[-4:] + stack[-6:-4]
     return True