[IPython-dev] embedding ipython, namespace question

[Darren Dale]

I found the start of a solution by digging into the IPython library,
especially
https://github.com/ipython/ipython/blob/master/IPython/kernel/zmq/ipkernel.py#L33
. After creating the in-process kernel, it is possible to reinitialize the
console namespace with, for example, `kernel.user_ns = globals()`. Now its
just a matter of wiring up the gui so the user_ns gets updated whenever the
console widget receives focus.
On Fri Jan 09 2015 at 11:38:33 AM Darren Dale <dsdale24 at gmail.com> wrote:

> On Sat Jan 03 2015 at 10:45:42 AM Darren Dale <dsdale24 at gmail.com> wrote:
>
>> Hi Ray,
>>
>> On Sat Dec 27 2014 at 8:48:20 PM Osborn, Raymond <rosborn at anl.gov> wrote:
>>
>>>  I don’t really understand what you are trying to achieve, but the
>>> ‘user_ns’ dictionary isn’t an isolated namespace - it’s the namespace that
>>> is used by the console, and I would have thought you would have to do some
>>> kind of injection to add other objects from within the application.
>>>
>>
>> What I am trying to achieve is explicitly documented at
>> http://ipython.org/ipython-doc/dev/interactive/reference.
>> html#embedding-ipython :
>>
>> ---
>>  It is also possible to embed an IPython shell in a namespace in your
>> Python code. This allows you to evaluate dynamically the state of your
>> code, operate with your variables, analyze them, etc. Note however that any
>> changes you make to values while in the shell do not propagate back to the
>> running code, so it is safe to modify your values because you won’t break
>> your code in bizarre ways by doing so.
>>
>> Note
>> At present, embedding IPython cannot be done from inside IPython. Run the
>> code samples below outside IPython.
>> [DD: I am not attempting to embed ipython from inside ipython]
>>
>> This feature allows you to easily have a fully functional python
>> environment for doing object introspection anywhere in your code with a
>> simple function call. In some cases a simple print statement is enough, but
>> if you need to do more detailed analysis of a code fragment this feature
>> can be very valuable.
>>
>> It can also be useful in scientific computing situations where it is
>> common to need to do some automatic, computationally intensive part and
>> then stop to look at data, plots, etc. Opening an IPython instance will
>> give you full access to your data and functions, and you can resume program
>> execution once you are done with the interactive part (perhaps to stop
>> again later, as many times as needed).
>> The following code snippet is the bare minimum you need to include in
>> your Python programs for this to work (detailed examples follow later):
>>
>>    from IPython import embed
>>    embed() # this call anywhere in your program will start IPython
>>
>> You can also embed an IPython kernel, for use with qtconsole, etc. via
>> IPython.embed_kernel(). This should function work the same way, but you can
>> connect an external frontend (ipython qtconsole or ipython console), rather
>> than interacting with it in the terminal.
>> ---
>>
>> This is impressively simple for the embed function:
>>
>> ---
>> C:\Users\darren> python
>> Python 2.7.8 |Continuum Analytics, Inc.| (default, Jul  2 2014, 15:12:11)
>> [MSC v.1500 64 bit (AMD64)] on win32
>> Type "help", "copyright", "credits" or "license" for more information.
>> Anaconda is brought to you by Continuum Analytics.
>> Please check out: http://continuum.io/thanks and https://binstar.org
>> >>> from IPython import embed
>> >>> a=1
>> >>> embed()
>> Python 2.7.8 |Continuum Analytics, Inc.| (default, Jul  2 2014, 15:12:11)
>> [MSC v.1500 64 bit (AMD64)]
>> Type "copyright", "credits" or "license" for more information.
>>
>> IPython 2.3.1 -- An enhanced Interactive Python.
>> Anaconda is brought to you by Continuum Analytics.
>> Please check out: http://continuum.io/thanks and https://binstar.org
>> ?         -> Introduction and overview of IPython's features.
>> %quickref -> Quick reference.
>> help      -> Python's own help system.
>> object?   -> Details about 'object', use 'object??' for extra details.
>>
>> In [1]: a
>> Out[1]: 1
>> ---
>>
>> But I have not been able to achieve the same behavior with the qt
>> in-process console.
>>
>
> If this is not possible, perhaps the documentation should be changed?
>
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