add deprecated shim for IPython.Config

it was accidentally removed altogether in 4.0

IPython/__init__.py

@@ -1,145 +1,157 b''
 # encoding: utf-8
 """
 IPython: tools for interactive and parallel computing in Python.
 
 http://ipython.org
 """
 #-----------------------------------------------------------------------------
 #  Copyright (c) 2008-2011, IPython Development Team.
 #  Copyright (c) 2001-2007, Fernando Perez <[e-mail]>
 #  Copyright (c) 2001, Janko Hauser <[e-mail]>
 #  Copyright (c) 2001, Nathaniel Gray <[e-mail]>
 #
 #  Distributed under the terms of the Modified BSD License.
 #
 #  The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 from __future__ import absolute_import
 
 import os
 import sys
+import warnings
 
 #-----------------------------------------------------------------------------
 # Setup everything
 #-----------------------------------------------------------------------------
 
 # Don't forget to also update setup.py when this changes!
 v = sys.version_info
 if v[:2] < (2,7) or (v[0] >= 3 and v[:2] < (3,3)):
     raise ImportError('IPython requires Python version 2.7 or 3.3 or above.')
 del v
 
 # Make it easy to import extensions - they are always directly on pythonpath.
 # Therefore, non-IPython modules can be added to extensions directory.
 # This should probably be in ipapp.py.
 sys.path.append(os.path.join(os.path.dirname(__file__), "extensions"))
 
 #-----------------------------------------------------------------------------
 # Setup the top level names
 #-----------------------------------------------------------------------------
 
 from .core.getipython import get_ipython
 from .core import release
 from .core.application import Application
 from .terminal.embed import embed
 
 from .core.interactiveshell import InteractiveShell
 from .testing import test
 from .utils.sysinfo import sys_info
 from .utils.frame import extract_module_locals
 
 # Release data
 __author__ = '%s <%s>' % (release.author, release.author_email)
 __license__  = release.license
 __version__  = release.version
 version_info = release.version_info
 
 def embed_kernel(module=None, local_ns=None, **kwargs):
     """Embed and start an IPython kernel in a given scope.
     
     If you don't want the kernel to initialize the namespace
     from the scope of the surrounding function,
     and/or you want to load full IPython configuration,
     you probably want `IPython.start_kernel()` instead.
     
     Parameters
     ----------
     module : ModuleType, optional
         The module to load into IPython globals (default: caller)
     local_ns : dict, optional
         The namespace to load into IPython user namespace (default: caller)
     
     kwargs : various, optional
         Further keyword args are relayed to the IPKernelApp constructor,
         allowing configuration of the Kernel.  Will only have an effect
         on the first embed_kernel call for a given process.
     """
     
     (caller_module, caller_locals) = extract_module_locals(1)
     if module is None:
         module = caller_module
     if local_ns is None:
         local_ns = caller_locals
     
     # Only import .zmq when we really need it
     from ipykernel.embed import embed_kernel as real_embed_kernel
     real_embed_kernel(module=module, local_ns=local_ns, **kwargs)
 
 def start_ipython(argv=None, **kwargs):
     """Launch a normal IPython instance (as opposed to embedded)
     
     `IPython.embed()` puts a shell in a particular calling scope,
     such as a function or method for debugging purposes,
     which is often not desirable.
     
     `start_ipython()` does full, regular IPython initialization,
     including loading startup files, configuration, etc.
     much of which is skipped by `embed()`.
     
     This is a public API method, and will survive implementation changes.
     
     Parameters
     ----------
     
     argv : list or None, optional
         If unspecified or None, IPython will parse command-line options from sys.argv.
         To prevent any command-line parsing, pass an empty list: `argv=[]`.
     user_ns : dict, optional
         specify this dictionary to initialize the IPython user namespace with particular values.
     kwargs : various, optional
         Any other kwargs will be passed to the Application constructor,
         such as `config`.
     """
     from IPython.terminal.ipapp import launch_new_instance
     return launch_new_instance(argv=argv, **kwargs)
 
 def start_kernel(argv=None, **kwargs):
     """Launch a normal IPython kernel instance (as opposed to embedded)
     
     `IPython.embed_kernel()` puts a shell in a particular calling scope,
     such as a function or method for debugging purposes,
     which is often not desirable.
     
     `start_kernel()` does full, regular IPython initialization,
     including loading startup files, configuration, etc.
     much of which is skipped by `embed()`.
     
     Parameters
     ----------
     
     argv : list or None, optional
         If unspecified or None, IPython will parse command-line options from sys.argv.
         To prevent any command-line parsing, pass an empty list: `argv=[]`.
     user_ns : dict, optional
         specify this dictionary to initialize the IPython user namespace with particular values.
     kwargs : various, optional
         Any other kwargs will be passed to the Application constructor,
         such as `config`.
     """
     from IPython.kernel.zmq.kernelapp import launch_new_instance
     return launch_new_instance(argv=argv, **kwargs)
     
+# deprecated shim for IPython.Config
+import traitlets.config
+class Config(traitlets.config.Config):
+    def __init__(self, *args, **kwargs):
+        warnings.warn(
+            "IPython.Config is deprecated and will be removed in IPython 5."
+            " Use traitlets.config.Config.",
+            DeprecationWarning, stacklevel=2,
+        )
+        super(Config, self).__init__(*args, **kwargs)
+