[Telepathy] Accessing Folks from python, part 2

[Philip Withnall]

On Tue, 2012-01-24 at 10:30 +0100, Tomeu Vizoso wrote:
> On Mon, Jan 23, 2012 at 17:45, Philip Withnall <philip at tecnocode.co.uk> wrote:
> > On Mon, 2012-01-23 at 16:21 +0100, Frederik Elwert wrote:
> >> Am Montag, den 23.01.2012, 14:40 +0000 schrieb Philip Withnall:
> >> > On Mon, 2012-01-23 at 10:22 +0100, Frederik Elwert wrote:
> >> > > Hello,
> >> > >
> >> > > I am still trying to write a Folks client in Python. Thanks again for
> >> > > the fast fix for my last issue.
> >> > >
> >> > > Since I had some trouble getting folks 0.6.6 running on Ubuntu 11.10, I
> >> > > just upgraded to 12.04, which has folks 0.6.6. Now I am trying again to
> >> > > digg into the python/Folks combo.
> >> > >
> >> > > I tried with this simple test script:
> >> > >
> >> > > ----8<----
> >> > > from gi.repository import GObject
> >> > > from gi.repository import Folks
> >> > >
> >> > >
> >> > > def list_individuals():
> >> > >     for key in aggregator.props.individuals.props.keys:
> >> > >         print aggregator.props.individuals.get(key)
> >> > >
> >> > > aggregator = Folks.IndividualAggregator.new()
> >> > > aggregator.prepare(None, None)
> >> > >
> >> > > GObject.timeout_add(2000, list_individuals)
> >> > >
> >> > > main_loop = GObject.MainLoop()
> >> > > main_loop.run()
> >> > > ---->8----
> >> > >
> >> > > Now I get this traceback:
> >> > >
> >> > > Traceback (most recent call last):
> >> > >   File "folkstest.py", line 6, in list_individuals
> >> > >     for key in aggregator.props.individuals.props.keys:
> >> > > TypeError: '__main__.GeeHashMapKeySet' object is not iterable
> >> > >
> >> > > So the gee bindings seem not to work the python way. I read the gee API
> >> > > doc, and then came up with something I had hoped would work:
> >> > >
> >> > > ----8<----
> >> > > def list_individuals():
> >> > >     iterator = aggregator.props.individuals.props.keys.iterator()
> >> > >     while iterator.has_next():
> >> > >         iterator.next()
> >> > >         key = iterator.get()
> >> > >         print aggregator.props.individuals.get(key)
> >> > > ---->8----
> >> > >
> >> > > This, however, segfaults. The issue seems to be the iterator.get()
> >> > > method call. I tried to get a backtrace using gdb, but since my
> >> > > debugging skills are very limited, I am not sure how useful it is. I
> >> > > attached it anyways, if you need more information, please just let me
> >> > > know.
> >> >
> >> > You should be able to trim the code down to:
> >> >
> >> > while iterator.next():
> >> >     key = iterator.get()
> >> >     print aggregator.props.individuals.get(key)
> >>
> >> Okay, I changed my sample script accordingly. Thanks for the hint.
> >> However, still segfaulting.
> >>
> >> > To my untrained eye, it looks like Python doesn't like the code, though,
> >> > since the stack trace contains a call to "PyErr_Print". If you inspected
> >> > this frame more closely (e.g. "frame 48; info locals" in gdb) that might
> >> > give a hint.
> >> >
> >> > In any case, could you use the "backtrace full" command in gdb to get a
> >> > more detailed stack trace please?
> >>
> >> I did this, please see the attached backtrace.
> >
> > Looks like you're missing debug information for Python. Could you make
> > sure you've got the Python runtime debug symbols installed and get a
> > better stack trace please?
> >
> > Hopefully then someone who knows about PyGObject can take a look at it.
> 
> Hi, it looks like a (transfer none) annotation that should be
> (transfer full) or the other way around.

Any idea as to where? In libgee or libfolks?

Philip

> Regards,
> 
> Tomeu
> 
> > Philip
> >
> >> > > Now I don’t know if I just used the API incorrectly, or if gee just does
> >> > > not work from Python. But I still hope to use Folks from python, and I
> >> > > wanted to investigate a bit further, before I ditch everything and start
> >> > > all over with vala.
> >> >
> >> > Don't give up! Every problem which gets fixed as a result of using folks
> >> > from Python will help everyone.
> >>
> >> You’re right. I just can be frustrating at times to spend all the time
> >> getting the prerequisites up and running, instead of actually writing
> >> code for the project.
> >>
> >> Anyway, thank you for your help!
> >>
> >> Regards
> >> Frederik
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> >
> >
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