[Ironpython-users] Scripting Ansys with IronPython - Unable to call values from dictionary

Ossi Heinonen ossi.heinonen at tut.fi
Thu Nov 24 09:54:15 CET 2011

Hi all!

I have a problem with scripting the FEA software Ansys Workbench with 
IronPython. I need to come up with a script that gets the variable 
values in an optimum point that I have found using the optimization tools.

I found some help for this with "VerifyCandidate" in the scripting guide 
in the Ansys manual and did this in the Ansys Workbench command window:

   IronPython 2.6.10920.0 on .NET 2.0.50727.3625
   system1 = GetSystem(Name="GDO")
   optimization1 = system1.GetContainer(ComponentName="Optimization")
   optimizationModel1 = optimization1.GetModel()
   verifiedValues = optimizationModel1.VerifyCandidate(Index=0)
   print verifiedValues
   {'/Optimization/OutputParameter:P3': '-0.035979796200990677 [mm]',
   '/Optimization/InputParameter:P1': '5.5 [mm]',
   '/Optimization/OutputParameter:P2': '0.07417053282883164 [kg]'}

Now I have a dictionary with my one design variable P1 and two responses 
P2 and P3 with their values at the optimum. Looking good so far. So now 
I only need to get my hands on the values and I'm home free.

I think this should give me the value of the design variable P1:

   KeyNotFoundException: /Optimization/InputParameter:P1

But no, I get an error saying that there is no such key. But when I list 
the keys, it's right there:

   '/Optimization/OutputParameter:P2', '/Optimization/InputParameter:P1']

So this is my problem. I've tried calling it without the quotes or with 
double quotes and any other variation that I've come up with. If I make 
a new dictionary manually with the exact same keys and values copied 
from the screen it works just fine. But I can't get anything out of the 
original dictionary.

Any ideas on how to get it working or what could be done to debug this? 
The only idea I've had is that for some reason the keys are printed 
incorrectly and some characters are actually missing from their names, 
but I might be totally off with this.

Needless to say that I'm a total newbie with Python. Probably the right 
people to ask are other Ansys users, but I've had no luck finding one 
that could help me. Maybe my luck will chance with you Python gurus :)

All help is greatly appreciated!

Best regards

Ossi Heinonen
Tampere University of Technology

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