Mailman 3 September 2022 - 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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Release 3.0.0
by Benedikt Reinartz Sept. 30, 2022

Sept. 30, 2022

Hi all, I'm proud to finally release the first new major version of Python.NET in 7 years. This is the culmination of over 2 years of work from many contributors to modernise the code base and support modern .NET and Python versions. Highlights: - Support for Python 3.9 and 3.10 - Support for .NET 6 - Codec system to control conversions between .NET and Python objects - Single assembly for all Python versions and operation systems (and thus also just a single wheel) - Significantly simplified the build system, only requires a modern .NET SDK to build the Python package The new package is available from PyPI and Nuget, respectively. Updated documentation is available here: https://pythonnet.github.io/pythonnet/ In particular, there is an updated Getting Started section that documents using .NET 6 (coreclr) from Python: https://pythonnet.github.io/pythonnet/python.html#getting-started While we tried to keep this release as backwards-compatible as possible, there are still some breaking changes. The changelog is available here: https://github.com/pythonnet/pythonnet/blob/master/CHANGELOG.md#300---2022-… Best Regards Benedikt

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Pythonnet causes Exception has occurred: "TypeLoadException" when running .net dll on linux
by Hossam Alzomor Sept. 27, 2022

Sept. 27, 2022

Hello, I have a dotnet dll build using dotnet6.0 on Ubuntu 20.04. I could use the dll using C# application. but when I try to test it using python script with pythonnet on Ubuntu 20.04 , I get the following error " Exception has occurred: TypeLoadException Could not load type of field 'ElmosLCC.ElmosLidarController:_updateWatchdog' (37) due to: Could not resolve type with token 0100004a from typeref (expected class 'System.Timers.Timer' in assembly 'System.ComponentModel.TypeConverter, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a') assembly:System.ComponentModel.TypeConverter, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a type:System.Timers.Timer member:(null) at (wrapper managed-to-native) System.RuntimeType.GetFields_native(System.RuntimeType,intptr,System.Reflection.BindingFlags,System.RuntimeType/MemberListType) at System.RuntimeType.GetFields_internal (System.String name, System.Reflection.BindingFlags bindingAttr, System.RuntimeType+MemberListType listType, System.RuntimeType reflectedType) [0x0001b] in <de882a77e7c14f8ba5d298093dde82b2>:0 at System.RuntimeType.GetField (System.String name, System.Reflection.BindingFlags bindingAttr) [0x00015] in <de882a77e7c14f8ba5d298093dde82b2>:0 at System.Type.GetField (System.String name) [0x00000] in <de882a77e7c14f8ba5d298093dde82b2>:0 at Python.Runtime.ClassManager.CreateClass (System.Type type) [0x00079] in <3972e4befd8f45a1b7c0e96a8f1f659a>:0 at Python.Runtime.ClassManager.GetClass (System.Type type) [0x00015] in <3972e4befd8f45a1b7c0e96a8f1f659a>:0 at Python.Runtime.ModuleObject.GetAttribute (System.String name, System.Boolean guess) [0x0008e] in <3972e4befd8f45a1b7c0e96a8f1f659a>:0 at Python.Runtime.ModuleObject.tp_getattro (System.IntPtr ob, System.IntPtr key) [0x00073] in <3972e4befd8f45a1b7c0e96a8f1f659a>:0 " I tested the dll on windows machine with pythonnet and it's working fine. Best Regards Hossam Alzomor [IZB Wolfsburg 2022 | Hall 2 | Booth 2405 | 11 - 13 Oct, 2022 | Wolfsburg]

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