Also wrote a simple console application using Python.Net, But PythonEngine.RunString() returns 'null' so I got error. namespace npythontest { class Program { static void Main(string[] args) { PythonEngine.Initialize(); IntPtr gs = PythonEngine.AcquireLock(); PyObject po = PythonEngine.RunString("2+3"); Trace.WriteLine("Python: " + po.ToString()); PythonEngine.ReleaseLock(gs); PythonEngine.Shutdown(); } } } Result is Unhandled Exception: System.NullReferenceException: Object reference not set toan instance of an object. at npythontest.Program.Main(String[] args) in c:\temp\npythontest\npythontest \Program.cs:line 20 I would expect above code will give some result. I think I'm stuck. On Mon, Apr 1, 2013 at 11:32 AM, brad@fie.us wrote:

It's running in process with your .net code. So it's the same standard output stream. A console's WriteLine() print statement should appear in the same place. In VS, my recollection is that there is a specific panel you can bring up in the debugger. Or, your project may be set to spawn an external console. Depends on your configuration. I don't know NUnit all that well. It's possible the NUnit's runtime redirects the output stream somewhere else as well.

-brad

On Apr 1, 2013, at 2:29 PM, Seungweon Park wrote:

Well, would you tell me how to check the console when I execute the PythonEngine.RunString("print 2+3")? I'm running the line from VS2012 debugging mode, so I don't know how to check the python console?

On Mon, Apr 1, 2013 at 11:23 AM, brad@fie.us wrote:

...

And have you checked the console to see if python is dutifully doing what you are asking it to do, which is print "5" to the output stream? That will not come back as a return value. You didn't ask it to give you an object. You asked it to print 5 to the output console.

On Apr 1, 2013, at 2:21 PM, Seungweon Park wrote:

Hi Brad,

Well, I tried both 'print 2+3' and '2+3', but both returned 'null'. I want to have both results of execution. That is, I want to have same results whatever nPython.exe gives us.

Thanks, Spark.

On Mon, Apr 1, 2013 at 11:08 AM, brad@fie.us wrote:

...

Yes it is supposed to work.

But I'd point out that there is a big difference between the statements:

print 2+3

and

2+3

What exactly would you expect to get back as a return from the print statement?

On Apr 1, 2013, at 2:00 PM, Seungweon Park wrote:

...

Hi,

I've been played with Python.Net http://python.net/ for a week, but I can't find any sample to use Python.Net http://python.net/ in embedded way. I've searched many threads from the previous emailing list, the result are not consistent, and looks like no solution ??.

What I'm trying to do is that I want to get result (po) from C# code after executing python command such as 'print 2+3' from python prompt.

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

Basically, is this feature one of Python.Net http://python.net/project intended for C#(.Net) to be able to call python commands/scripts?

Thank you, Spark.

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(); } } }

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