From c2e76b0c526ec3ad2c923362d750b54d509120f8 Mon Sep 17 00:00:00 2001
From: Edward Stone <edwastone@gmail.com>
Date: Sun, 2 Mar 2014 17:25:55 +0800
Subject: [PATCH] Fix bug: Namespace switch prevents LT from returning eval
 result if source file contains errors.

---
 py-src/ltipy.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/py-src/ltipy.py b/py-src/ltipy.py
index f3229c5..292df63 100644
--- a/py-src/ltipy.py
+++ b/py-src/ltipy.py
@@ -17,6 +17,7 @@ def noop():
 requests = {}
 connected = noop
 disconnected = noop
+curNs = None
 
 def km_from_string(s=''):
     """create kernel manager from IPKernelApp string
@@ -183,7 +184,10 @@ def initIPy(s):
     disconnected()
 
 def setNs(path):
+  if path==curNs: return
   send("import lttools\nlttools.switch_ns('" + path.replace('\\', '\\\\') + "')")
+  time.sleep(0.1) #wait for msgloop to clear this namespace switch
+  path = curNs
 
 def IPyOutput(l):
   m = re.search('--existing (.*\.json)', l)