Fix imports for plain terminal ipython and use a proper warn() call.

IPython/__init__.py

@@ -44,7 +44,7 b' from .config.loader import Config'
 from .core.getipython import get_ipython
 from .core import release
 from .core.application import Application
-from .frontend.terminal.embed import embed
+from .terminal.embed import embed
 
 from .core.error import TryNext
 from .core.interactiveshell import InteractiveShell

IPython/frontend.py

@@ -23,15 +23,10 b' from __future__ import print_function'
 # Stdlib
 import sys
 import types
+from warnings import warn
 
-m = """\
-*** WARNING*** : The top-level `frontend` package has been deprecated.
-All its subpackages have been moved to the top `IPython` level."""
-
-print(m, file=sys.stderr)
-
-# FIXME: turn this into a Warning once we've fixed all our own imports.
-#raise DeprecationWarning(m)
+warn("The top-level `frontend` package has been deprecated. "
+     "All its subpackages have been moved to the top `IPython` level.")
 
 #-----------------------------------------------------------------------------
 # Class declarations

IPython/scripts/ipython

@@ -2,6 +2,6 b''
 """Terminal-based IPython entry point.
 """
 
-from IPython.frontend.terminal.ipapp import launch_new_instance
+from IPython.terminal.ipapp import launch_new_instance
 
 launch_new_instance()

IPython/terminal/embed.py

@@ -36,8 +36,8 b' except:'
 
 from IPython.core import ultratb, compilerop
 from IPython.core.magic import Magics, magics_class, line_magic
-from IPython.frontend.terminal.interactiveshell import TerminalInteractiveShell
-from IPython.frontend.terminal.ipapp import load_default_config
+from IPython.terminal.interactiveshell import TerminalInteractiveShell
+from IPython.terminal.ipapp import load_default_config
 
 from IPython.utils.traitlets import Bool, CBool, Unicode
 from IPython.utils.io import ask_yes_no

IPython/terminal/ipapp.py

@@ -47,7 +47,7 b' from IPython.core.magics import ScriptMagics'
 from IPython.core.shellapp import (
     InteractiveShellApp, shell_flags, shell_aliases
 )
-from IPython.frontend.terminal.interactiveshell import TerminalInteractiveShell
+from IPython.terminal.interactiveshell import TerminalInteractiveShell
 from IPython.utils import warn
 from IPython.utils.path import get_ipython_dir, check_for_old_config
 from IPython.utils.traitlets import (
@@ -223,10 +223,10 b' class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):'
         ]
 
     subcommands = Dict(dict(
-        qtconsole=('IPython.frontend.qt.console.qtconsoleapp.IPythonQtConsoleApp',
+        qtconsole=('IPython.qt.console.qtconsoleapp.IPythonQtConsoleApp',
             """Launch the IPython Qt Console."""
         ),
-        notebook=('IPython.frontend.html.notebook.notebookapp.NotebookApp',
+        notebook=('IPython.html.notebook.notebookapp.NotebookApp',
             """Launch the IPython HTML Notebook Server."""
         ),
         profile = ("IPython.core.profileapp.ProfileApp",
@@ -235,10 +235,10 b' class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):'
         kernel = ("IPython.kernel.zmq.kernelapp.IPKernelApp",
             "Start a kernel without an attached frontend."
         ),
-        console=('IPython.frontend.terminal.console.app.ZMQTerminalIPythonApp',
+        console=('IPython.terminal.console.app.ZMQTerminalIPythonApp',
             """Launch the IPython terminal-based Console."""
         ),
-        locate=('IPython.frontend.terminal.ipapp.LocateIPythonApp',
+        locate=('IPython.terminal.ipapp.LocateIPythonApp',
             LocateIPythonApp.description
         ),
         history=('IPython.core.historyapp.HistoryApp',