Python.NET August 2004

pythonnet@python.org

9 participants
7 discussions

Runs OK on Linux with Mono
by zunzun＠zunzun.com 17 Aug '04

17 Aug '04

Python For .NET beta 3 runs fine for me with Mono version 1.01 on Linux. I do get "free(): invalid pointer" messages, presumably from garbage collection (??) but it does seem to run fine. James Phillips http://zunzun.com

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PythonNet crashes
by COOL Steven 13 Aug '04

13 Aug '04

Hello I've downloaded and unpacked the PythonNet 1.0, beta 3. When I try to run Python.exe, I get an unhandled-exception window. then, I tried to copy the clr.dll and the python.runtime.dll to my existing python directory. when I try to import CLR.System, I get the same error. Anybody knows what goes wrong here? regards Steven Cool Protronic NV Rozendaalstraat 53 BE-8900 Ieper P: + 32 (0)57 22 47 09 E-mail: steven.cool(a)protronic.be **** DISCLAIMER **** The contents of this e-mail are intended for the named addressee only. It contains information which may be confidential and which may also be privileged. Unless you are the named addressee (or authorised to receive for the addressee) you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it. Further, we make every effort to keep our network free from viruses. However, you do need to verify that this email and any attachments are free of viruses as we can take no responsibility for any computer virus which might be transferred by way of this e-mail.

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Application scripting - Embedding/Extending Python. solution
by Sam Iredale 09 Aug '04

09 Aug '04

I got it working. Here's my sample code: using System; using Python.Runtime; namespace PyTest { /// <summary> /// Summary description for Class1. /// </summary> class PyTestClass { PyObject module = null; PyObject func = null; PyTestClass() { PythonEngine.Initialize(); } ~PyTestClass() { PythonEngine.Finalize(); } void Scratch() { } /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main(string[] args) { try { // initiliaze the engine PyTestClass pyTest = new PyTestClass(); if(!PythonEngine.IsInitialized) throw new Exception("PythonEngine not initialized."); // load the module and the dictionary pyTest.module = PythonEngine.ImportModule("PyTest"); // get a reference to the function named "test" from the Python script pyTest.func = pyTest.module.GetAttr((string) "test"); // if the reference we got in the above call in callable, call it. if(pyTest.func.IsCallable()) { PyObject[] obj = new PyObject[1]; // an array of objects representing the function arguments PyTuple tup; // we'll pass the arguments to the funciton in a tuple // convert our string into a PyObject and place it in the array obj[0] = PyObject.FromManagedObject((string) "Embedding and Extending."); // convert the array of PyObjects into a single PyTuple tup = new PyTuple(obj); // call the Ivoke method of the funciton reference with the tuple containing // the function arguements. pyTest.func.Invoke(tup); } } catch(Exception e) { Console.WriteLine(e.Message); Console.Write(e.StackTrace); } } } public class PyTestInterface { public PyTestInterface() { // do nothing, just making a public constructor } public void PyTestMsg(string testname) { Console.WriteLine("Test Pass! " + testname); } } } And here's the sample Python script: import CLR # gives this Python script access to managed namespaces from CLR.System.Reflection import Assembly # for importing managed assemblies asm = Assembly.LoadWithPartialName("PyTest.exe") from CLR.PyTest import PyTestInterface # mports the interface for this applicaiton iface = PyTestInterface() def test(str): print "testing:" iface.PyTestMsg(str) print "test finished."; test("Extending") I hope this helps someone out there. There are certainly a number of ways this can be done. But this specific approach leads me in the direction I need to go in order to solve the problems I want to solve. SI

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IronPython: trying to build assemblies and call them from other .Net modules
by Garth T Kidd 09 Aug '04

09 Aug '04

Anyone lucked out on this one? Figuring snippets.dll is the output assembly and adding a reference to it, I can browse IronPython's classes if I have a class defined in the Python code I just ran. I can't, however, see the class I defined. :| Regards, Garth.

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Making progress on embedding.
by Sam Iredale 06 Aug '04

06 Aug '04

Still working on the problem of embedding Python for application scripting in a C# project. I'm having problems getting the Python script to call back into the C# code, though the application successfully loads the Python script module. My C# code has evolved to this: using System; using Python.Runtime; namespace PyTest { /// <summary> /// Summary description for Class1. /// </summary> public class PyTestClass { public PyObject module = null; public PyTestClass() { PythonEngine.Initialize(); } ~PyTestClass() { PythonEngine.Finalize(); } /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main(string[] args) { try { PyTestClass pyTest = new PyTestClass(); if(!PythonEngine.IsInitialized) throw new Exception("PythonEngine not initialized."); pyTest.module = PythonEngine.ImportModule("PyTest"); } catch(Exception e) { Console.WriteLine(e.Message); Console.Write(e.StackTrace); } } } public class PyTestInterface { public PyTestInterface() { // do nothing, just making a public constructor } public void PyTestMsg() { Console.WriteLine("Test Pass!"); } } } And my Python script has evolved to this: import CLR from CLR.PyTest import PyTestInterface def test(): print "testing." obj=PyTestInterface() obj.PyMessage() test() Any help would be ... well ... very ... helpful. Thanks, SI

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Embedded scripting
by Sam Iredale 05 Aug '04

05 Aug '04

I'm trying to embed Python for application scripting in my C# solution. I've managed to load the Python module form C#; but how do I get the Python script to call back into the application? The "from MODULE import CLASS" semantics throw an exception here; and I think it's because the class being called is in the same process (not in a dll). Here's the test C# code: using System; using Python.Runtime; namespace PyTest { /// <summary> /// Summary description for Class1. /// </summary> public class PyTestClass { PyObject module = null; public PyTestClass() { PythonEngine.Initialize(); } ~PyTestClass() { PythonEngine.Finalize(); } public void PyMessage() { Console.WriteLine("PyMessage() has been called."); } /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main(string[] args) { PyTestClass pyTest = new PyTestClass(); try { if(!PythonEngine.IsInitialized) throw new Exception("PythonEngine not initialized."); pyTest.module = PythonEngine.ImportModule("PyTest"); } catch(Exception e) { Console.WriteLine(e.Message); Console.Write(e.StackTrace); } } } } And the Python script: from PyTest.PyTest import PyTestClass def test(): print "testing." PyTestClass.PyMessage() test(); I know the embedding is working; because when the module is loaded, if I comment out the import line and the call to the PyTestClass in the script, the string "testing." is output to the console. But once I put in the stuff that calls back into the C# code, it throws a PythonException. Any ideas? Thanks, SI

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compiling IronPython
by Steffen Guhlemann 04 Aug '04

04 Aug '04

Hi, i tried it - and in Interpretermodus everything worked fine. But did anybody find out, how the "advertised" compiling to native IL is supposed to work? ciao Steffen > Hi! > > Probably you all know IronPython (been vapourware a long time)... now > you can find on IronPythons homepage, http://www.ironpython.com, an > alpha version of it (means version 0.6). > > I've only tested it under Windows, with both .NET Framework 1.1 and Mono > 1.0 and it seems to work. Well, untill no it is not as mature as > CPython, but I've got Windows.Forms running without errors. > > greets, > Marek

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Python.NET August 2004