Getting traceback information from IronPython exceptions - exception

Question

I have IronPython hosted within my application, whenever I catch an exception thrown from a script, I get unhelpful gibberish like this:
IronPython.NewTypes.System.Exception_1$1: Error occurred during conversion ---> Microsoft.Scripting.ArgumentTypeException: expected int, got DispMethod
at _stub_$245##245(Closure , CallSite , Object )
at Microsoft.Scripting.Actions.MatchCaller.Call1[T0,TRet](Func`3 target, CallSite site, Object[] args)
at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
at Microsoft.Scripting.Actions.UpdateDelegates.Update1[T,T0,TRet](CallSite site, T0 arg0)
at _stub_$227##227(Closure , CallSite , Object )
at IronPython.Runtime.Converter.Convert(Object value, Type to)
at IronPython.Runtime.Operations.ArrayOps.SetItem(Array data, Int32 index, Object value)
at _stub_$244##244(Closure , CallSite , Object , Object , Object )
at Microsoft.Scripting.Actions.MatchCaller.Call3[T0,T1,T2,TRet](Func`5 target, CallSite site, Object[] args)
at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
at Microsoft.Scripting.Actions.UpdateDelegates.Update3[T,T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
at ConvertToFgf$223##223(Closure , Object , Object , Object )
at _stub_$192##192(Closure , CallSite , CodeContext , Object , Object , Object , Object )
at Microsoft.Scripting.Actions.MatchCaller.Call5[T0,T1,T2,T3,T4,TRet](Func`7 target, CallSite site, Object[] args)
at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
at Microsoft.Scripting.Actions.UpdateDelegates.Update5[T,T0,T1,T2,T3,T4,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
at Convert$224##224(Closure , Object , Object )
--- End of inner exception stack trace ---
at Convert$224##224(Closure , Object , Object )
at _stub_$42##42(Closure , CallSite , CodeContext , Object , Object , Object )
at Microsoft.Scripting.Actions.MatchCaller.Call4[T0,T1,T2,T3,TRet](Func`6 target, CallSite site, Object[] args)
at Microsoft.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
at Microsoft.Scripting.Actions.UpdateDelegates.Update4[T,T0,T1,T2,T3,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
at Run$225##225(Closure )
What I would like to get instead is the python traceback. Is there anyway to get this information?

Answer 1

If you just need a text version you can do:
engine.GetService<ExceptionOperations>().FormatException(exception);
If you really need the Python track back object I would suggest:
Func<PythonTuple> exc_info = engine.Operations.GetMember<Func<PythonTuple>>(engine.GetSysModule(), "exc_info");
Save that somewhere useful and then when you need to invoke it:
TraceBack tb = (TraceBack)exc_info()[2];
That'll work as long as you're catching the exception.
A slightly less supported but easier way to do this would be:
TraceBack tb = PythonOps.GetExceptionInfoLocal(context, exception)[2];
But you need a CodeContext to do this. In 2.0 you can get a CodeContext by:
new CodeContext(new PythonDictionary(), HostingHelpers.GetLanguageContext(engine));