Fixing InteractiveShell creation

IPython/core/tests/refbug.py

@@ -23,6 +23,12 b' from IPython.core import ipapi'
 #-----------------------------------------------------------------------------
 # Globals
 #-----------------------------------------------------------------------------
+
+# This needs to be here because nose and other test runners will import
+# this module. Importing this module has potential side effects that we
+# want to prevent.
+if __name__ == '__main__':
+
 ip = ipapi.get()
 
 if not '_refbug_cache' in ip.user_ns:

docs/sphinxext/ipython_directive.py

@@ -220,7 +220,7 b' class EmbeddedSphinxShell(object):'
         config.InteractiveShell.colors = 'NoColor'
 
         # Create and initialize ipython, but don't start its mainloop
-        IP = InteractiveShell(parent=None, config=config)
+        IP = InteractiveShell.instance(config=config)
 
         # Store a few parts of IPython we'll need.
         self.IP = IP