Technique to synchronize error codes in a same-project-API

In the project I am working right now, we have some python and some C# code. At some point, I call from python a subprocess which starts a C# executable. This C# code returns an error code, which has to be understood on the python side and a readable report has to be created.

This means, both sides "must speak the same language". So, at the end I have to handle a mapping {error codes: readable explanation} (normally we implement this as static properties of a enumeration class). This is of course a case of code duplication, and prone to be inconsistent.

My ideas to mitigate this have been so far:

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  Automatically generate code: let's say when the mapping on the C# part changes, the code will be parsed and automatically generated on the the python side. While I think this is technically quite correct, I have to somehow parse C# code and translate it to valid python code, which is something probably hard to get it right at the first time.

  
  


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  Partial processing of error code on the python side. This means, just check for zero or non-zero return value, and if non-zero, read the stdout of the C# process and report it, no matter what. While this is very easy to implement, I see some possible caveats, like the C# process crashing in an unexpected way and reporting some exception traceback or similar.

  
  

Since this must be a quite common problem, I would like to know what are the easiest and more maintainable approaches used in the industry. Thanks.