Remove a shadow namespace that does nothing.

IPython/core/interactiveshell.py

@@ -34,7 +34,6 b' from IPython.core import oinspect'
 from IPython.core import magic
 from IPython.core import page
 from IPython.core import prefilter
-from IPython.core import shadowns
 from IPython.core import ultratb
 from IPython.core.alias import Alias, AliasManager
 from IPython.core.autocall import ExitAutocall
@@ -1155,8 +1154,6 b' class InteractiveShell(SingletonConfigurable):'
         ns['_oh'] = self.history_manager.output_hist
         ns['_dh'] = self.history_manager.dir_hist
 
-        ns['_sh'] = shadowns
-
         # user aliases to input and output histories.  These shouldn't show up
         # in %who, as they can have very large reprs.
         ns['In']  = self.history_manager.input_hist_parsed

IPython/core/tests/test_imports.py

@@ -45,9 +45,6 b' def test_import_prompts():'
 def test_import_release():
     from IPython.core import release
 
-def test_import_shadowns():
-    from IPython.core import shadowns
-
 def test_import_ultratb():
     from IPython.core import ultratb