Refactor to exit and raise immediately on exit.

Sadly make it python 2 also.

IPython/terminal/embed.py

@@ -46,41 +46,19 b' class EmbeddedMagics(Magics):'
             print ("This embedded IPython will not reactivate anymore "
                    "once you exit.")
 
-    if sys.version_info > (3,):
 
         @line_magic
-        def raise_on_exit(self, parameter_s=''):
-            """%raise_on_exit [True|False]: Make the current embeded kernel to raise an exception on exit.
-
-            You can change that again during current session by calling `%raise_on_exit` with `True`/`False` as parameter
+    def exit_raise(self, parameter_s=''):
+        """%exit_raise Make the current embedded kernel exit and raise and exception.
 
             This function (after asking for confirmation) sets an internal flag so
-            that an embedded IPython will raise a `KillEmbeded` Exception on exit.  This is useful to
-            permanently exit a loop that create IPython embed instance.
-
-            Available only for Python 3.
+        that an embedded IPython will raise a `KillEmbeded` Exception on exit.
+        This is useful to permanently exit a loop that create IPython embed
+        instance.
             """
-            parameter_s = parameter_s.strip().lower()
-
-            should_raise = None
-            if parameter_s in {'yes', 'raise', 'true', '1'}:
-                should_raise = True
-            elif parameter_s in {'no', 'false', '0', 'None'}:
-                should_raise = False
-            else:
-                if self.shell.should_raise :
-                    print("The current embed instance will raise on exit, use `%raise_on_exit False` to disable")
-                    return
-                else:
-                    print("The current embed instance will not raise on exit, use `%raise_on_exit True` to enable")
-                    return
 
-            if should_raise:
                 self.shell.should_raise = True
-                print ("This embedded IPython will raise while exiting.")
-            else :
-                self.shell.should_raise = False
-                print ("This embedded IPython will not raise while exiting.")
+        self.shell.ask_exit()