moved DummyMod to proper namespace to enable pickling

IPython/core/interactiveshell.py

@@ -186,6 +186,11 b' class ReadlineNoRecord(object):'
         ghi = self.shell.readline.get_history_item
         return [ghi(x) for x in range(start, end)]
 
+
+class DummyMod(object):
+    "A dummy module used for IPython's interactive namespace."
+    pass
+
 #-----------------------------------------------------------------------------
 # Main IPython class
 #-----------------------------------------------------------------------------
@@ -1035,9 +1040,6 b' class InteractiveShell(SingletonConfigurable):'
         """
         if user_module is None and user_ns is not None:
             user_ns.setdefault("__name__", "__main__")
-            class DummyMod(object):
-                "A dummy module used for IPython's interactive namespace."
-                pass
             user_module = DummyMod()
             user_module.__dict__ = user_ns
             

IPython/terminal/embed.py

@@ -29,6 +29,7 b' import warnings'
 
 from IPython.core import ultratb, compilerop
 from IPython.core.magic import Magics, magics_class, line_magic
+from IPython.core.interactiveshell import DummyMod
 from IPython.terminal.interactiveshell import TerminalInteractiveShell
 from IPython.terminal.ipapp import load_default_config
 
@@ -185,9 +186,6 b' class InteractiveShellEmbed(TerminalInteractiveShell):'
         there is no fundamental reason why it can't work perfectly."""
         
         if (global_ns is not None) and (module is None):
-            class DummyMod(object):
-                """A dummy module object for embedded IPython."""
-                pass
             warnings.warn("global_ns is deprecated, use module instead.", DeprecationWarning)
             module = DummyMod()
             module.__dict__ = global_ns