Embedding Python libraries in C# project

I need to use a specific Python library (SciPy) in a C# application. Application will be deployed to machines that do not have Python installed, and it should not be a prerequisite. I am trying to use Pythonnet to integrate Python into my C# application. I downloaded and installed Pythonnet NuGet package via Visual Studio. I then copied Python311.dll to my solution folder (so it would be shipped with my application when installed on other machines), and I am now trying to test it with the code sample from Pythonnet docs:

    private void TestPython()
    {
        Runtime.PythonDLL = @"D:\Projects\MyProject\dlls\python311.dll";
        PythonEngine.Initialize();
        using (Py.GIL())
        {
            dynamic np = Py.Import("numpy");
            Console.WriteLine(np.cos(np.pi * 2));

            dynamic sin = np.sin;
            Console.WriteLine(sin(5));

            double c = (double)(np.cos(5) + sin(5));
            Console.WriteLine(c);

            dynamic a = np.array(new List<float> { 1, 2, 3 });
            Console.WriteLine(a.dtype);

            dynamic b = np.array(new List<float> { 6, 5, 4 }, dtype: np.int32);
            Console.WriteLine(b.dtype);

            Console.WriteLine(a * b);
            Console.ReadKey();
        }
    }

The python311.dll is recognized and accepted, but I get an error 'No module named 'numpy'' on line dynamic np = Py.Import("numpy");. This is, of course, because I don't have numpy library installed.

Problem is, if I install it via pip, the library DLLs will not be embedded into my application (they will be in C:\Users\Administrator\AppData\Local\Programs\Python\Python311\Lib). I can probably copy them over to solution folder like I did with python311.dll, but I don't know how to tell Py to use them, rather than search for them in regular Python installation directories.

Can anyone advise?

Just copy the numpy library folder from your python installation folder ( let's say C:\Users\Administrator\AppData\Local\Programs\Python\Python311\Lib) to your executable folder.

Additionally, you need to tell python where is your library located. If you have several libraries, you can have a modules sub-folder on your executable folder. Then, the way we tell python to take that folder to search for modules is:

using (Py.GIL())
{
    dynamic sys = Py.Import("sys");
    sys.path.insert(0, ".\\modules");
    //...

Put that before importing numpy. Hope it works!