IronPython script ClosureCell type error

Scripting
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1

I have a relatively large (~5000 line) Python file of class and function definitions that I am trying to import into a Python script. I’m running Rhino 7 on Windows. When I attempt to run this file using either _RunPythonScript or _EditPythonScript, I get the following error message(with the repeating bit truncated):

Instance property 'Item070' is not defined for type 'Microsoft.Scripting.MutableTuple `2[Microsoft.Scripting.MutableTuple`128[IronPython.Runtime.ClosureCell, . . ., IronPython.Runtime.ClosureCell]]'

This error traces back to the import statement for the large file. As this happens as soon as the import, I cannot run debugging. From what I have gathered in the forums, ClosureCells are Rhino’s way of tracking IronPython pointers in the .NET space. I haven’t been able to find anything else.

I noticed this error when attempting to merge two fully-tested Git branches. Each works independently, and the code changes should not affect one another. Interestingly, when I remove a few variable definitions, the script runs with no errors. When I add a few new definitions of the sort a = 1 and b = 2, I get the same error again. Attempting to del a, b does not solve the problem.

Has anyone seen this error? My hunch is that I am running out of namespace memory for the IronPython debug within Rhino. Is this correct? Any suggestions for how to deal with this?

3

Hi Alex, Does the same error happen if you import it into regular Iron Python, or do you have Rhino / GH API calls in there preventing this by tripping a different error first?

4

Hello! The file I’m trying to import uses quite a bit of rhinoscriptsyntax, so I cannot run it outside of Rhino.

5

Ah never mind then. I found this person had a similar issue: python - IronPython Microsoft.Scripting.MutableTuple Exception - Stack Overflow so it can occur outside of Grasshopper too.

I’m not familiar with them, but can you just replace all the MutableTuples with a good old Python list, or is that going to require too much memory?

Good luck!

6

Thank you! I don’t have any MutableTuples in the code; from my understanding, these are artifacts of the interpreter. Upon further investigation, when I split the function definition into two functions, I am able to run with no errors. But I am unsatisfied with this error message and wish either IronPython or Rhino could be more descriptive of what is actually going on.