From e1f1617ed7310d0be6911b8c5801f8d4cf34ac0f 2014-01-29 05:20:44
From: MinRK <benjaminrk@gmail.com>
Date: 2014-01-29 05:20:44
Subject: [PATCH] flush output before showing tracebacks

closes #3700
---

diff --git a/IPython/kernel/zmq/zmqshell.py b/IPython/kernel/zmq/zmqshell.py
index 9a5f38c..c2d044b 100644
--- a/IPython/kernel/zmq/zmqshell.py
+++ b/IPython/kernel/zmq/zmqshell.py
@@ -501,6 +501,9 @@ class ZMQInteractiveShell(InteractiveShell):
         self.payload_manager.write_payload(payload)
 
     def _showtraceback(self, etype, evalue, stb):
+        # try to preserve ordering of tracebacks and print statements
+        sys.stdout.flush()
+        sys.stderr.flush()
 
         exc_content = {
             u'traceback' : stb,