[IPython-dev] MultipleInstanceError

MinRK benjaminrk@gmail....
Sun Jun 30 23:19:46 CDT 2013


Does it embed with IPython.embed()?  That's probably what changed -
IPython.embed properly using the instance method, which I know it didn't at
some point.

The 'workaround' might be something like:

1. save the InteractiveShell instance
2. call ip.__class__.clear_instance()
3. proceed to embed
4. after embed, restore the instance (this will probably be the messiest
bit)

I can look into allowing embed to be called without disrupting the
singleton.


On Sun, Jun 30, 2013 at 8:50 PM, Aaron Meurer <asmeurer@gmail.com> wrote:

> I bisected it to
>
> commit c5e77f946f77dd95ab086ea3e02802c4874c5e3d
> Author: MinRK <benjaminrk@gmail.com>
> Date:   Fri Feb 8 21:41:19 2013 -0800
>
>     next release will be 1.0
>
> which means either I bisected it incorrectly (possible, since I was
> relying on python setup.py develop), or there is something in the
> version checking logic of PuDB.
>
> My use case is to add pudb.set_trace() to something in sympy and run
> isympy, which launches IPython. Then I press ! in PuDB to open IPython
> in the namespace of the function I am debugging.
>
> Aaron Meurer
>
> On Sun, Jun 30, 2013 at 10:33 PM, MinRK <benjaminrk@gmail.com> wrote:
> > This shouldn't be something that has changed since 0.11. Are you seeing a
> > difference between 0.13 and master?
> >
> > The workaround is to not use `instance` to create new instances of
> objects.
> > The result will be that methods asking for the global instance will
> retrieve
> > the original global instance, as opposed to the new one. I don't know if
> > this is acceptable or not.
> >
> >
> >
> > On Sun, Jun 30, 2013 at 7:44 PM, Fernando Perez <fperez.net@gmail.com>
> > wrote:
> >>
> >> Mmh, I'm not sure there's one at this point. Min might know, the
> >> current enforcement of the single-instance rule is wired deep inside
> >> the config machinery.
> >>
> >> On Sun, Jun 30, 2013 at 7:23 PM, Aaron Meurer <asmeurer@gmail.com>
> wrote:
> >> > So what is the workaround for PuDB?
> >> >
> >> > Aaron Meurer
> >> >
> >> > On Sun, Jun 30, 2013 at 9:21 PM, Fernando Perez <fperez.net@gmail.com
> >
> >> > wrote:
> >> >> 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.
> >> >>
> >> >> Cheers,
> >> >>
> >> >> f
> >> >>
> >> >> 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
> >> >>>> _______________________________________________
> >> >>>> IPython-dev mailing list
> >> >>>> IPython-dev@scipy.org
> >> >>>> http://mail.scipy.org/mailman/listinfo/ipython-dev
> >> >>>
> >> >>>
> >> >>>
> >> >>> _______________________________________________
> >> >>> IPython-dev mailing list
> >> >>> IPython-dev@scipy.org
> >> >>> http://mail.scipy.org/mailman/listinfo/ipython-dev
> >> >>>
> >> >>
> >> >>
> >> >>
> >> >> --
> >> >> Fernando Perez (@fperez_org; http://fperez.org)
> >> >> fperez.net-at-gmail: mailing lists only (I ignore this when swamped!)
> >> >> fernando.perez-at-berkeley: contact me here for any direct mail
> >> >> _______________________________________________
> >> >> IPython-dev mailing list
> >> >> IPython-dev@scipy.org
> >> >> http://mail.scipy.org/mailman/listinfo/ipython-dev
> >> > _______________________________________________
> >> > IPython-dev mailing list
> >> > IPython-dev@scipy.org
> >> > http://mail.scipy.org/mailman/listinfo/ipython-dev
> >>
> >>
> >>
> >> --
> >> Fernando Perez (@fperez_org; http://fperez.org)
> >> fperez.net-at-gmail: mailing lists only (I ignore this when swamped!)
> >> fernando.perez-at-berkeley: contact me here for any direct mail
> >> _______________________________________________
> >> IPython-dev mailing list
> >> IPython-dev@scipy.org
> >> http://mail.scipy.org/mailman/listinfo/ipython-dev
> >
> >
> >
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> >
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