[IPython-dev] migration issues, embedding latest IPython in another application

MinRK benjaminrk at gmail.com
Wed Aug 15 15:25:38 EDT 2012

On Wed, Aug 15, 2012 at 12:13 PM, Thomas Kluyver <takowl at gmail.com> wrote:

> Hi Matt,
> On 15 August 2012 18:15, Matt Anderson <manderso at broadcom.com> wrote:
> > To remedy, should the implementation of this function call
> InteractiveShellEmbed.instance() instead of InteractiveShellEmbed()?
> Looking at the code for embed(), it has these three lines:
>     global _embedded_shell
>     if _embedded_shell is None:
>         _embedded_shell = InteractiveShellEmbed(**kwargs)
> So it's effectively implementing a singleton pattern itself. It looks
> to me like it would make more sense to use the .instance() API that's
> used elsewhere in the code, but I'm not familiar with the reason it
> was originally done a different way.

embed was implemented before the singleton stuff came together.  It
probably should use instance(), but doing so has one disadvantage: It would
break the ability to call embed() from within an existing IPython session.
 I don't know if anyone cares about that use case, though.

> I think Fernando might be most familiar with that bit of the code.
> He's very busy at the moment, so it might be a few days before he can
> chime in.
> Thanks,
> Thomas
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