Calling Python from C# using Pythonnet throws import error

Question

I have a use case where I want to be able to call a function which is written in Python from my C# code base. When I make a call to this function I want to be able to pass C# types(custom classes) to Python function and for that I was exploring pythonnet.

Python project has a following sample structure –

main.py
service1.py

main.py has the main function which calls the methods exposed by service1.py –

from Service1 import MyService1

def Run(a, b):
   service1 = MyService1()
   service1.method(a, b)

Now from C# side when I try to execute the Python it is throwing error –

Python.Runtime.PythonException: ‘No module named ‘Service1”

C# code –

Runtime.PythonDLL = @"C:Program FilesPython39Python39.dll";
PythonEngine.Initialize();
using (Py.GIL())
{
  using (var scope = Py.CreateScope())
  {
     scope.Exec(File.ReadAllText(@"..Pythonmain.py"));
   }
 }

How do I need to import the required classes correctly?

Asked By: arpymastro

||

Source

Answer 1

I was running into this issue because my Python scripts were not part of the build folder. I had to ensure that the required Python files are part of the build folder on the successful build of the solution.

To make a file part of your build folder you will need to –
Right click on file in VS -> Properties -> Copy To Output directory -> select Copy Always or Copy if newer.

Alternatively, you can do this from .csproj file as well.

Answered By: arpymastro

Calling Python from C# using Pythonnet throws import error

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