[Telepathy] Accessing Folks from python, part 2

[Frederik Elwert]

Am Montag, den 23.01.2012, 16:45 +0000 schrieb Philip Withnall:
> 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?

Yes, look like it. But I made sure I installed python-dbg, and gdb
prints this on startup:

Reading symbols from /usr/bin/python...Reading symbols
from /usr/lib/debug/usr/bin/python2.7...done.

Is there any other package with debug symbols that might be missing
here? I am sorry, but I am not very familiar with gdb magic.

> Hopefully then someone who knows about PyGObject can take a look at it.
> 
> 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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> > telepathy at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/telepathy
> 
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