[IPython-dev] MultipleInstanceError

Fernando Perez fperez.net@gmail....
Sun Jun 30 21:21:31 CDT 2013

Indeed, way back when IPython made blunt assumptions about being more
or less in control of the user session, and created lots of global
state. That made sense when it was only an interactive user shell, but
now that it's a service to manage namespaces, its core should be much
more constrained in how it pollutes global structures.

Unfortunately as Thomas said, cleaning this up takes time and isn't at
the top of the priority list.



On Sun, Jun 30, 2013 at 8:31 AM, Thomas Kluyver <takowl@gmail.com> wrote:
> Various parts of the IPython machinery assume that there's only one instance
> in a given process, and would break with multiple IPython shells in a single
> process. We're slowly moving away from that, but it's not high priority for
> us.
> Thomas
> On 30 June 2013 05:52, Aaron Meurer <asmeurer@gmail.com> wrote:
>> In IPython dev, if you try to start an IPython instance from within an
>> IPython instance, it raises MultipleInstanceError. What is the purpose
>> of this? It breaks a use-case of mine, which is to start PuDB from
>> within IPython, then to open the IPython interpreter from within PuDB
>> while debugging?  Is the new way to do things to somehow reattach to
>> the same IPython instance?
>> I've CCd the PuDB list.
>> Aaron Meurer
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Fernando Perez (@fperez_org; http://fperez.org)
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