[QGIS-Developer] Catch Python exceptions in QGIS console

[Jorge Gustavo Rocha]

Hi Nyall,

This problem only happens in Windows. In Linux, everything is running fine.

I was convinced that it was a Python exception, but for some reason, it
was not caught.

I will investigate this issue further. It makes me crazy!

Thank you for the feedback,

Jorge


Às 00:05 de 14/06/19, Nyall Dawson escreveu:
> On Fri, 14 Jun 2019 at 00:11, Jorge Gustavo Pereira Bastos Rocha
> <jgr at di.uminho.pt> wrote:
>>
>> Hi devs,
>>
>> Am I able to catch Python exceptions in Python console?
> 
> Yes, definitely
> 
>>
>> I'm trying to debug a DB Manager related issue [1] using pg_services. I have the following piece of code, that runs fine in my computer, but fails on any other computer, within a specific intranet.
>>
>> import psycopg2
>> print (psycopg2.__version__)
>> try:
>>     connection = psycopg2.connect(service='pg_trabalho')
>>     cursor = connection.cursor()
>>     print ( connection.get_dsn_parameters(),"\n")
>>     cursor.execute("SELECT version();")
>>     record = cursor.fetchone()
>>     print("Connected to - ", record,"\n")
>> except:
>>     print( psycopg2.InterfaceError )
>>     print( psycopg2.OperationalError )
>>
>> When I run it, QGIS crashes [2]. I would prefer to handle the exception myself. How can I catch the exception without crashing QGIS?
> 
> This crash isn't caused by a Python exception -- it's something
> deeper. If it was just a Python exception you'd see exactly the same
> results as something like
> 
>     a = [1]
>     print(a[2])
> 
> Unfortunately, these kinds of crashes can be extremely difficult to
> diagnose (especially if they are only reproducible on Windows). If you
> can reproduce on Linux, I'd suggest running under valgrind and looking
> for clues.
> 
> Nyall
> 

J. Gustavo
-- 
Jorge Gustavo Rocha
Departamento de Informática
Universidade do Minho
4710-057 Braga
Tel: +351 253604480
Fax: +351 253604471
Móvel: +351 910333888
skype: nabocudnosor