Merge pull request #4738 from minrk/no-user-help

don't inject help into user_ns

IPython/core/interactiveshell.py

@@ -1125,13 +1125,6 b' class InteractiveShell(SingletonConfigurable):'
         # http://mail.python.org/pipermail/python-dev/2001-April/014068.html
         ns = dict()
         
-        # Put 'help' in the user namespace
-        try:
-            from site import _Helper
-            ns['help'] = _Helper()
-        except ImportError:
-            warn('help() not available - check site.py')
-
         # make global variables for user access to the histories
         ns['_ih'] = self.history_manager.input_hist_parsed
         ns['_oh'] = self.history_manager.output_hist