Mailman 3 February 2016 - 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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PythonNet on Cygwin
by Nikhil Garg June 21, 2017

June 21, 2017

Hi Guys, I was wondering if anyone knows how to make Python for .Net work on cygwin installation of python. I have been looking around and find a mixed bag of information. If anyone knows of the working version of Python for .Net and its dependency, I would appreciate if you could share it with me. Currently, I am using a generic windows version and it works just fine, but I need it to work on Cygwin version of python. I appreciate any helpful replies. Thanks, Nikhil

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cx_freeze and python.net
by Boris Burdin May 22, 2017

May 22, 2017

Hello everybody, I'm trying to build a python.net application using cx-freeze . Once the application is built, I put in my final folder the Python.Runtime.dll. but it stil doesn't seem to work . Actually, when I run the .exe file, nothing is happening. So, I wonder if there were something else to do, another dll to put in the folder, or any option to use with cx_freeze when building the application ? i would be very grateful if you could help me on this matter .. Thanks in advance, Boris

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pythonnet appdomain(s)
by Adam Klein Sept. 7, 2016

Sept. 7, 2016

Hello, Is there a design reason that pythonnet loads C# assemblies into its own AppDomain rather than establishing a separate AppDomain? It would be useful for instance when developing in C# in parallel with writing python code (say, in the ipython REPL) to be able to reload C# assemblies dynamically. Also, we've found it useful in Initialize() to enable shadow copying, to prevent file locking, ie internal static void Initialize() { ... AppDomain domain = AppDomain.CurrentDomain; // prevent file locking domain.SetShadowCopyFiles(); domain.SetShadowCopyPath(null); Although these are deprecated methods, and really it should be establishing a new AppDomain as above. Regards, Adam _________________________________ Adam D Klein BlueMountain Capital Management LLC 280 Park Ave, 5th Floor East New York, NY 10017 O:(212)905-2136 C:(917)331-8871

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Re: [Python.NET] Casting an object to a different interface
by Matthias Hillenbrand Feb. 29, 2016

Feb. 29, 2016

Thanks! Bryan Loyd's method of casting to an interface seems to be what I am looking for. However, I get an error in combination with the commercial API: > surfaceCB = ZOSAPI.Editors.LDE.ISurfaceCoordinateBreak(surface) E TypeError: object does not implement ISurfaceCoordinateBreak I will try to get a further hint from the support of the commercial software I am struggling with.

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Casting an object to a different interface
by Matthias Hillenbrand Feb. 26, 2016

Feb. 26, 2016

Hi, The Python win32com module for accessing COM objects provides a method CastTo for casting an object to a different interface. Similarly, in my application, I have to cast an object to another .Net interface. Does Python.Net provide such a method or can you describe a way of doing the casting using C# libraries? Here is a small example: I have an object of type ILDERow and want to cast it to ISurfaceCoordinateBreak. Using win32com this can be done in the following way: from win32com.client import CastTo cbSurface = CastTo(surface, "ISurfaceCoordinateBreak") Thank you very much! Best regards, Matthias

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PythonEngine.Initialize() exception
by Simunic,Kresimir Feb. 23, 2016

Feb. 23, 2016

Hi all, I have a following problem - I installed Python and am calling PythonEngine.Initialize() from C#. I get following exception: The value should not be NULL. Parameter name: key. The software is running on Windows Server 2012 R2. Does anybody know what could be the problem ? Thanks ! Best, Kresimir. Reifenh?user Reicofil GmbH & Co. KG Spicher Stra?e 46, 53844 Troisdorf, Germany Registergericht Siegburg, Reg.Nr. HR A 4534 USt-IdNr. DE 814359351, Steuer-Nr. 5220/5760/0426 Reifenh?user Reicofil Verwaltungs-GmbH Registergericht Siegburg, Reg.Nr. HR B 788 Gesch?ftsf?hrer: Dr.-Ing. Bernd Kunze Please note: This message may contain information which is privileged, confidential and proprietary.

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TypeError: unindexable object
by Rog F Feb. 18, 2016

Feb. 18, 2016

Hello, I'm trying to set an object property based on an indexer as described in the C# example here: https://msdn.microsoft.com/en-us/library/hh964567.aspx, but both examples fail with "TypeError: unindexable object" Python code looks like this: criteria = ManagementPackClassCriteria("Name = 'Microsoft.Windows.Computer'") classes = mg.EntityTypes.GetClasses(criteria) CIClass = classes[0] instance = CreatableEnterpriseManagementObject(mg, CIClass) print "instance: "+str(instance) # this isnt None mprop = CIClass["PrincipalName"] instance[mprop].Value = "foo" C# .NET equivalent would be something like this: ManagementPackClass CIClass = mp.GetClass("Microsoft.Windows.Computer"); ManagementPackProperty mprop = CIClass["PrincipalName"]; instance[mprop].Value = "foo"; Error appears to be thrown in pythonnet classobject.cs (https://github.com/pythonnet/pythonnet/blob/master/src/runtime/classobject.…) Are there any back doors through pythonnet/System.Runtime.something that i can use to get around this? Works fine with IronPython, however i cant package up & use AWS boto3 library with IronPython which i also need (but can with py2exe + pythonnet) - so ideally want to use pythonnet. Thanks! Roger

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Is PythonNET or IronPython still supported?
by Denis Akhiyarov Feb. 13, 2016

Feb. 13, 2016

discussion about ironpython and pythonnet on reddit: https://www.reddit.com/r/Python/comments/45gfy1/is_pythonnet_or_ironpython_…

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pythonnet 2.1 release
by Denis Akhiyarov Feb. 8, 2016

Feb. 8, 2016

Can we find out what is blocking to release pythonnet 2.1 without ".dev0" tag on it? WinPython distribution is considering pythonnet for inclusion once this stable version is released. What are the issues blocking merging develop into master branch and then release this on pypi? The only issue I see is python 3.5 support: https://github.com/pythonnet/pythonnet/issues/103 Finally should the tests be included with the wheels so that people can run the tests on their specific set of CPython and .NET/Mono platform? Thanks, Denis

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