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disallow no-prefix `ipython foo=bar` argument style....
disallow no-prefix `ipython foo=bar` argument style. This style is in rc1, but will be removed in rc2. Since they don't match any flag pattern, rc1-style arguments will be interpreted by IPython as files to be run. So `ipython gui=foo -i` will exec gui=foo, and pass '-i' to gui=foo. Presumably this file won't exist, so there will be an error: Error in executing file in user namespace: gui=foo Assignments *must* have two leading '-', as in: ipython --foo=bar all flags (non-assignments) can be specified with one or two leading '-', as in: ipython -i --pylab -pdb --pprint script.py or ipython --i -pylab --pdb -pprint script.py but help only reports two-leading, as single-leading options will likely be removed on moving to argparse, where they will be replaced by single-letter aliases. The common remaining invalid option will be: ipython -foo=bar and a suggestion for 'did you mean --foo=bar'? will be presented in these cases.
Thomas Kluyver - - Load All Authors

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autocall.py
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#!/usr/bin/env python
# encoding: utf-8
"""
Autocall capabilities for IPython.core.
Authors:
* Brian Granger
* Fernando Perez
* Thomas Kluyver
Notes
-----
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2008-2009 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
class IPyAutocall(object):
""" Instances of this class are always autocalled
This happens regardless of 'autocall' variable state. Use this to
develop macro-like mechanisms.
"""
_ip = None
rewrite = True
def __init__(self, ip=None):
self._ip = ip
def set_ip(self, ip):
""" Will be used to set _ip point to current ipython instance b/f call
Override this method if you don't want this to happen.
"""
self._ip = ip
class ExitAutocall(IPyAutocall):
"""An autocallable object which will be added to the user namespace so that
exit, exit(), quit or quit() are all valid ways to close the shell."""
rewrite = False
def __call__(self):
self._ip.ask_exit()
class ZMQExitAutocall(ExitAutocall):
"""Exit IPython. Autocallable, so it needn't be explicitly called.
Parameters
----------
keep_kernel : bool
If True, leave the kernel alive. Otherwise, tell the kernel to exit too
(default).
"""
def __call__(self, keep_kernel=False):
self._ip.keepkernel_on_exit = keep_kernel
self._ip.ask_exit()