[IPython-dev] use of InteractiveShell and R magic

MinRK benjaminrk@gmail....
Thu Jun 14 18:26:01 CDT 2012


On Thu, Jun 14, 2012 at 3:57 PM, Jonathan Taylor <
jonathan.taylor@stanford.edu> wrote:

> Thanks, that seems to work in a separate python process rather than the
> ipython process:
>
> ~/workbook (metadata*) $ python -c "import
> IPython.frontend.terminal.interactiveshell as IS; shell =
> IS.TerminalInteractiveShell(); shell.run_cell('%load_ext rmagic');
> shell.run_cell('%R X=rnorm(20); print(X)')"
>  [1]  0.2125483  0.1030451 -1.4036373 -0.5617847 -0.7571675 -0.3985085
>  [7] -0.4386932  0.7164915 -0.4794236 -0.1373804  0.2831013 -0.7248862
> [13]  0.5260675 -0.3789804  0.1535592  1.5569203  1.0225972  0.8149846
> [19] -0.9629060 -0.4161373
>
> ~/workbook (metadata*) $ python -c "import
> IPython.frontend.terminal.interactiveshell as IS; shell =
> IS.InteractiveShell(); shell.run_cell('%load_ext rmagic');
> shell.run_cell('%R X=rnorm(20); print(X)')"
>  [1]  0.44037484  1.31372601 -0.37253955  2.21955270 -0.07886852
> -0.09022193
>  [7]  0.38464850 -0.41004855  1.62648041 -0.13687832  0.91537699
> -2.70125217
> [13]  1.49125226  0.11580012 -0.64993087  2.49367657  0.01447792
>  0.57408249
> [19] -0.80559871 -0.76346964
>
> So, for interactively running this in ipython I should expect to see this
> load_ext failure?
>
>
You are running into some singleton assumptions in the new magics system -
each Magics class methods are only registered once, and thus bound to the
first Shell that load the magic.

So what you are seeing is that shell.magic("load_ext rmagic") is actually
triggering the load_ext magic on the *original* IPython instance.  I think
this should be considered a bug.


> Thanks,
>
> Jonathan
>
> On Thu, Jun 14, 2012 at 3:48 PM, Thomas Kluyver <takowl@gmail.com> wrote:
>
>> On 14 June 2012 23:44, Jonathan Taylor <jonathan.taylor@stanford.edu>
>> wrote:
>> > Actually, I want to create an InteractiveShell inside another python
>> > process. Maybe I should use embed?
>>
>> Embed's not terribly relevant here - that creates an InteractiveShell,
>> but attempts to use the namespace from which it's called.
>>
>> Try it in a separate Python process. Don't forget to %load_ext rmagic
>> first.
>>
>> Thomas
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>
>
>
> --
> Jonathan Taylor
> Dept. of Statistics
> Sequoia Hall, 137
> 390 Serra Mall
> Stanford, CA 94305
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>
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