Would you share your idea how to call python command from embedded Python.Net?

Question

I've been played with Python.Net for a week, but I can't find any sample code to use Python.Net in embedded way although Python.Net source has several embeddeding tests. I've searched many threads from the previous emailing list (Python.Net), the results are not consistent and are clueless.

What I'm trying to do is to get result (PyObject po) from C# code after executing python command such as 'print 2+3' from python prompt via Python.Net because IronPython doesn't have compatibility with the module that I currently using.

When I executed it from nPython.exe, it prints out 5 as I expected. However, when I run this code from embedded way from C#. it returns 'null' always. Would you give me some thoughts how I can get the execution result?

Thank you, Spark.

Enviroments: 1. Windows 2008 R2, .Net 4.0. Compiled Python.Net with Python27, UCS2 at VS2012 2. nPython.exe works fine to run 'print 2+3'

using NUnit.Framework;
using Python.Runtime;

namespace CommonTest
{
    [TestFixture]
    public class PythonTests
    {
        public PythonTests()
        {

        }
        [Test]
        public void CommonPythonTests()
        {

            PythonEngine.Initialize();

            IntPtr gs = PythonEngine.AcquireLock();
            PyObject po = PythonEngine.RunString("print 2+3");
            PythonEngine.ReleaseLock(gs);

            PythonEngine.Shutdown();
        }
    }
}

spark · Accepted Answer · 2013-04-05 18:26:19Z

8

It seems like PythonEngine.RunString() doesn't work. Instead, PythonEngine.RunSimpleString() works fine.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Reflection;
using Python.Runtime;

namespace npythontest
{
    public class Program
    {
        static void Main(string[] args)
        {
            string external_file = "c:\\\\temp\\\\a.py";

            Console.WriteLine("Hello World!");
            PythonEngine.Initialize();

            IntPtr pythonLock = PythonEngine.AcquireLock();

            var mod = Python.Runtime.PythonEngine.ImportModule("os.path");
            var ret = mod.InvokeMethod("join", new Python.Runtime.PyString("my"), new Python.Runtime.PyString("path"));
            Console.WriteLine(mod);
            Console.WriteLine(ret);
            PythonEngine.RunSimpleString("import os.path\n");
            PythonEngine.RunSimpleString("p = os.path.join(\"other\",\"path\")\n");
            PythonEngine.RunSimpleString("print p\n");
            PythonEngine.RunSimpleString("print 3+2");
            PythonEngine.RunSimpleString("execfile('" + external_file + "')");

            PythonEngine.ReleaseLock(pythonLock);
            PythonEngine.Shutdown();
        }
    }
}

answered Apr 5, 2013 at 18:26

spark

5316 silver badges18 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

spark Over a year ago

In the meantime, when you run it as a console application, it works fine and displays the output correctly, but I don't get output when I run below code from a method. Any suggestions to get the output by redirection?

Spry Over a year ago

I realize it has been a while since your post, but I am looking to do the same thing and was wondering if you remember what you eventually went with. The idea is to redirect the result of Python commands from my C# application.

Collectives™ on Stack Overflow

Would you share your idea how to call python command from embedded Python.Net?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related