Mailman 3 March 2013 - Python.NET

Multithreading/multiprocessing
by Alan Macdonald May 5, 2025

May 5, 2025

Hello, has anyone successfully used multithreading or multiprocessing with Python.Net? I tried to multi-thread from the .Net side and the Python.Net libraries seem to have issues in the RunScript method. I had to take an implementation off the web of that method because the shipped method doesn’t seem to work. I then had a working multi-processing example from CPython that I tried from Python.Net but it gives an error 'module' object has no attribute 'argv' When trying to create a process pool by executing the line pool = Pool(processes=4) Is it possible to do multithreading or multiprocessing with Python.Net? Thanks, Alan

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Python 3 version of Python for .NET
by Tony Roberts June 3, 2013

June 3, 2013

Hi, I've made the necessary changes to the Python for .NET package for it to work with Python 3. What's the best way to get this integrated back into the main project? Can I get access to the svn repo and check it into a branch for peer review and integration? Or should I email someone a patch file? thanks, Tony

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How to compile Python for .Net in VS2010 and .NET 4?
by Seungweon Park April 8, 2013

April 8, 2013

Hello, I downloaded from SVN, and tried to compile it in VS2010 with Windows 2008 R2. However, it requires Mono.Unix reference in error message. so I installed mono(mono-2.10.9-gtksharp-2.12.11-win32-0.exe from http://www.go-mono.com/mono-downloads/download.html. And added Mono.Posix.dll as reference, and compiled again, got error. FYI, I selected build option as DebugWin/x86. ------------------------------------------------------------------------------ The command "call "buildclrmodule.bat" x86 "c:\cvs\pythonnet\src\runtime\" "c:\cvs\pythonnet\src\runtime\bin\x86\release\clr.pyd" copy "c:\cvs\pythonnet\src\runtime\bin\x86\Release\Python.Runtime.dll" "c:\cvs\pythonnet\" copy "c:\cvs\pythonnet\src\runtime\bin\x86\Release\*.pdb" "c:\cvs\pythonnet" copy "c:\cvs\pythonnet\src\runtime\bin\x86\Release\clr.pyd" "c:\cvs\pythonnet" " exited with code 1." ------------------------------------------------------------------------------ Any idea? Thanks, spark. [image: Inline image 1]

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How to Compile python for .Net in VS 2010 in .Net 4.0
by Rama Nanditha Danda April 8, 2013

April 8, 2013

Hello, I downloaded from SVN, and tried to compile it in VS2010.I have Python 2.6.6 version on 64 bit windows 7. I changed projects framework t0 4.0 I changed clrmodule.il version to 4:0:0:0 changed post build events command line to %windir%\Microsoft.NET\Framework\v4.0.30319\ilasm /nologo /dll /quiet /output="$(TargetDir)clr.pyd" "$(ProjectDir)clrmodule.il" I made above changes and rebuilded it.Python.exe is closing when i hit clr.AddReference Could anyone , please guide me here. Thank you, Rama Danda

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Setting PYTHONPATH from code
by Sharon Rozenblum April 5, 2013

April 5, 2013

Hi! Can someone tell me how to set PYTHONPATH variable in code when working with Python.Runtime.dll without changing the value in the system variables before. Thanks SHARON ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies).

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how to load and execute py file which consumes a thrid part C-based python extension in C# code
by lizy10b March 29, 2013

March 29, 2013

Hi there, I am a freshman and new to python.net. I have a *.py script which calls a third part python library, and the library is a ctypes python wrapper of a C++ dll (or say C-based python extension?). Frist I tried to make it using IronPython. IronPython works well when I load a pure python *.py (no third part libraries) file and execute it in C# code. But it failed when I load a *.py which comsumes a thrid part ctypes python wrapper library mentioned above. Then I turn to python.net. But I don't know how to load and execute *.py in C# code using python.net. Thanks. Zhiyu Li Student China 2013-03-28 lizy10b

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How to run a command by Embedded Python?
by Seungweon Park March 28, 2013

March 28, 2013

Hi, I wrote a code PythonWrapper and SimplePythonTest which uses PythonWrapper. using SimplePython; namespace SimplePythonTest { /// <summary> /// Python Wrapper Tests /// </summary> [TestFixture] public class PythonTests { PythonWrapper py; /// <summary> /// PythonTests Constructor /// </summary> public PythonTests() { py = new PythonWrapper(); py.Init(); PyObject po; po = py.LoadModule("os"); po = py.LoadModule("sys"); po = py.LoadModule("psutil"); } /// <summary> /// Python Simple Test /// </summary> [Test] public void CommonPythonTests() { PyObject po = py.Execute("os.getcwd()"); Trace.WriteLine(po.Repr()); py.Close(); } } } namespace SimplePython { /// <summary> /// Python Wrapper via XMLRPC/Python 2.7.3/.Net for Python. /// </summary> public class PythonWrapper { /// <summary> /// Inter Lock /// </summary> private IntPtr gs; /// <summary> /// Constructor /// </summary> public PythonWrapper() { } /// <summary> /// Initialize PythonEngine /// </summary> public void Init() { PythonEngine.Initialize(); gs = PythonEngine.AcquireLock(); } /// <summary> /// Load Module /// </summary> /// <param name="strModule">Module Name</param> /// <returns></returns> public PyObject LoadModule(string strModule) { return PythonEngine.ImportModule(strModule); } /// <summary> /// Execute Python Command /// </summary> /// <param name="strCommand">Python Command</param> /// <returns></returns> public PyObject Execute(string strCommand) { PyObject po = PythonEngine.RunString(strCommand); return po; } public void Close() { PythonEngine.ReleaseLock(gs); PythonEngine.Shutdown(); } } } When testing (CommonPythonTests), it initializes and loads modules, but PythonEngine.RunString() doesn't seem to work properly. Is any something wrong in my code which gets os.getcwd()? Furthermore, I can't find the difference between PythonEngine.RunString() and PythonEngine.RunSimpleString(). Thank you, Spark.

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How to use Python for .NET? Have a problem to use in Windows 2008 R2 SP1
by Seungweon Park March 22, 2013

March 22, 2013

Hello, I just downloaded pythonnet-2.0-Beta0-clr4.0_140_py27.zip from http://sourceforge.net/projects/pythonnet/, and extract to c:\temp and ran nPython.exe, got below error. Current my test machine has Windows 2008 R2 SP1 with Python 2.7.3 (32bit). When looked the error, and googled it. someone says I need to copy python27.dll into c:\windows\system32. However, I can't find the file. Any idea? Thank you, Spark, C:\temp\pythonnet20>nPython.exe Unhandled Exception: System.DllNotFoundException: Unable to load DLL 'python27': The specified module could not be found . (Exception from HRESULT: 0x8007007E) at Python.Runtime.Runtime.Py_Initialize() at Python.Runtime.Runtime.Initialize() in D:\Users\Barton\Documents\Visual Studio 2010\Projects\PySharp\trunk\pythonn et\src\runtime\runtime.cs:line 78 at Python.Runtime.PythonConsole.Main(String[] args) in D:\Users\Barton\Documents\Visual Studio 2010\Projects\PySharp\ trunk\pythonnet\src\console\pythonconsole.cs:line 21

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Loading C# DLLs from CPython
by Alex Campbell March 20, 2013

March 20, 2013

Hi, We need to access C# managed DLLs from CPython. The obvious choice is IronPython, but this is not easily possible since we can't swap out the interpreter. We saw Pythonnet, and from the description it seemed that it would provide a package for accessing C# from Python. Unfortunately, rather than a module, it seems to be just the interpreter (which doesn't avoid the issue of not being able to swap the interpreter out). The only other solution we see is to use nPython or IronPython to make a COM interface, access this COM interface using a python library, and importing that python library into CPython. Does anyone see a less convoluted way of doing this? Thanks, -Alex

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Survey for framework and library developers: "Information needs in software ecosystems"
by Nicole Haenni March 4, 2013

March 4, 2013

Hi, I’m Nicole Haenni and I'm doing research for my thesis at the University of Berne (scg.unibe.ch) with Mircea Lungu and Niko Schwarz. We are researching on monitoring the activity in software ecosystems. This is a study about information needs that arise in such software ecosystems. I need your help to fill out the survey below. It takes about 10 minutes to complete it. A software ecosystem can be a project repository like GitHub, an open source community (e.g. the Apache community) or a language-based community (e.g. Smalltalk has Squeaksource, Ruby has Rubyforge). We formulate our research question as follows: "What information needs arise when developers use code from other projects, or see their own code used elsewhere." Survey link: http://bit.ly/14Zc71N or original link: https://docs.google.com/spreadsheet/viewform?formkey=dFBJUmVodVU1V3BMMGRPRW… Thank you for your support! Nicole Haenni ----------------------------------------- Software Composition Group Institut für Informatik Universität Bern Neubrückstrasse 10 CH-3012 Bern SWITZERLAND

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