From a695d66933a57fc3fb7d239502ebc11a5e336ebd Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Sun, 2 Sep 2012 11:18:26 -0400
Subject: [PATCH] mailpipe: use `messages.sort(...)`, not `m = sorted(m, ...)`.

---
 pygrader/mailpipe.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pygrader/mailpipe.py b/pygrader/mailpipe.py
index daae3e2..3f9f7c3 100644
--- a/pygrader/mailpipe.py
+++ b/pygrader/mailpipe.py
@@ -662,7 +662,7 @@ def _load_messages(course, stream, mailbox=None, input_=None, output=None,
             ombox = _mailbox.Maildir(output, factory=None, create=True)
     else:
         raise ValueError(mailbox)
-    messages = sorted(messages, key=_get_message_time)
+    messages.sort(key=_get_message_time)
     for key,msg in messages:
         try:
             ret = _parse_message(
-- 
2.26.2