Mailman 3 - Python.NET

Uses PythonNet with current Python installation
by thane＠magna-capital.com 28 Sep '04

28 Sep '04

I'm not sure why, but copying the PythonNet DLLs (CLR.dll and Python.Runtime.dll) to a standard CPython installation directory, does not give the CPython "real" access to the CLR. Two observations: 1. The CLR modules don't load on the first try (see output below), and 2. Running modules that require the CLR will sometimes fail (I'll investigate this some more). I've written a .Net backend for matplotlib, which runs fine with the Python distribution from PythonNet (Brian's distribution), but it crashes when the DLLs are in the CPython distribution from Python.org. I'm stumped. could it be related to the "loading delay" above? Any ideas? --- Output from CPython with PythonNet DLLs in the directory -------- C:\Python\Python2.3.3>python Python 2.3.3 (#51, Dec 18 2003, 20:22:39) [MSC v.1200 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import os >>> os.system('dir *.dll') Volume in drive C has no label. Volume Serial Number is 7CEC-BD8B Directory of C:\Python\Python2.3.3 09/08/2004 09:48 PM 2,560 CLR.dll 09/08/2004 09:47 PM 98,304 Python.Runtime.dll 12/18/2003 08:22 PM 974,915 python23.dll 3 File(s) 1,075,779 bytes 0 Dir(s) 13,137,387,520 bytes free 0 >>> from CLR.System import String getattr: proxy getattr: dict getattr: __path__ Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: No module named System >>> from CLR.System import String >>> mystr = String('fubar') >>> mystr <CLR.System.String object at 0x008E5D10> >>> Thane Plummer, Ph.D. CEO Magna Capital, LLC (520) 760-4957 (520) 405-2277 (cell) thane(a)magna-capital.com www.magna-capital.com

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.NET backend working
by thane＠magna-capital.com 24 Sep '04

24 Sep '04

I've got an alpha version of a .NET backend up and running for matplotlib (http://matplotlib.sourceforge.net/ ). It was just intended to be "proof-of-concept" code, but it works. This back end is targeted for anyone using PythonNet (see http://www.zope.org/Members/Brian/PythonNet/index_html ). It should also be compatible with IronPython (see http://ironpython.com/) once the standard libraries and Numarray (or Numeric) are available for the IronPython release. If there is any interest, please respond to this post and I'll go through the trouble of adding it to the project (at this point I don't know how to do this, so any guidance here would be appreciated). --Thane Thane Plummer, Ph.D. CEO Magna Capital, LLC (520) 760-4957 (520) 405-2277 (cell) <mailto:thane@magna-capital.com> thane(a)magna-capital.com <http://www.magna-capital.com> www.magna-capital.com

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Procedure for building Python.Runtime.dll
by david Powell 17 Sep '04

17 Sep '04

I was hoping to experiment with modifications to component files in the runtime. Most just making some things public. I cannot get nmake to work with the makefile in \PythonNet-1.0-beta3\src This is on both XP and 2k machines. The nmake comes with Visual studio and on my system is found in c:\program files\microsoft visual studio .NET 2003\sdk\v1.1\bin Any thoughts? Regards David

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PythonNet does not work with my Zope
by cb 09 Sep '04

09 Sep '04

Hi, I tried to work with the Net connection in Zope. (Zope 2.7.2-0, python 2.3.3, win32) I copied the files CLR.dll, Python.Runtime.dll and Python.Runtime.key to F:\Programme\Zope-2.7.2-0\bin (where Python.exe is) Starting Zope as a program and than executing a Python function with the following code >>> snip ------------------------------------------- import CLR from CLR import System System.Console.WriteLine("oktest") print "durch" >>>snip ------------------------------------------- prints "oktest" on the console and then the program hangs. PythonNet-1.0-beta3 works fine on my computer. What's wrong? Thanks Carsten

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Embedding Python/Python.NET under C++
by tommyadam＠freenet.de 02 Sep '04

02 Sep '04

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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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