Fixing two small bugs in :mod:`IPython.kernel`.

* In :mod:`IPython.kernel.launcher` we were not handling the lookup of
  ``job.exe`` properly on Windows if the HPC pack was not installed.
* When :mod:`IPython.kernel.client` was imported, Twisted was giving
  warnings that we have silenced.

IPython/kernel/client.py

@@ -24,15 +24,25 b' The main classes in this module are:'
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
-# Imports
+# Warnings control
 #-----------------------------------------------------------------------------
 
-import sys
 import warnings
 
-# from IPython.utils import growl
-# growl.start("IPython1 Client")
+# Twisted generates annoying warnings with Python 2.6, as will do other code
+# that imports 'sets' as of today
+warnings.filterwarnings('ignore', 'the sets module is deprecated',
+                        DeprecationWarning )
+
+# This one also comes from Twisted
+warnings.filterwarnings('ignore', 'the sha module is deprecated',
+                        DeprecationWarning)
+
+#-----------------------------------------------------------------------------
+# Imports
+#-----------------------------------------------------------------------------
 
+import sys
 
 from twisted.internet import reactor
 from twisted.internet.error import PotentialZombieWarning
@@ -73,8 +83,6 b' rit.setDaemon(True)'
 rit.start()
 
 
-
-
 __all__ = [
     'MapTask',
     'StringTask',

IPython/kernel/launcher.py

@@ -23,7 +23,7 b' from IPython.core.component import Component'
 from IPython.external import Itpl
 from IPython.utils.traitlets import Str, Int, List, Unicode
 from IPython.utils.path import get_ipython_module_path
-from IPython.utils.process import find_cmd, pycmd2argv
+from IPython.utils.process import find_cmd, pycmd2argv, FindCmdError
 from IPython.kernel.twistedutil import (
     gatherBoth,
     make_deferred,
@@ -538,7 +538,10 b' class SSHEngineSetLauncher(BaseLauncher):'
 # This is only used on Windows.
 def find_job_cmd():
     if os.name=='nt':
+        try:
         return find_cmd('job')
+        except FindCmdError:
+            return 'job'
     else:
         return 'job'