Mailman 3 - Python.NET

Debugging python code embedded in C# in Visual Studio 2022
by ikargm＠gmail.com 22 Nov '23

22 Nov '23

Hi, I have a project in C# and visual studio 2022. The project uses a few scripts in python that are embedded in C# code using the Python.Net interface. I have used the application with several several different versions of python and wotkd perfectly. I am looking a descrptive and usable way to be able to debug my python code while I am in C# code and debugging it. In other words to be able to break in python code from C# code. With IronPython this was doable in Visual studio but I am not using IronPython anymore. Thanks in advance. IK

1 0

Help with an ObservableCollection
by hopkins.jesse＠gmail.com 09 May '23

09 May '23

Hi, I'm newly trying to use python .NET to embed some C# dlls into my python program. I'm very new to anything .NET, so I apologize if this is a simple question. In order to execute part of the program I need to submit some information back to an object in one of the dlls. This class is expecting an ObservableCollection of objects. I tried submitting a python list, but got an error that it couldn't be converted to the correct type. Unfortunately I can't share the API I'm using for licensing reasons, but here's a short pseudo code of the C# (using 'vegetable' to stand in for some proprietary object types): private ObservableCollection<VegetableRecord> vegetableRecords private VegetableSequence VegetableSequence .... newVegetableRecord1 = new VegetableRecord('Potato') newVegetableRecord2 = new VegetableRecord('Carrot') vegetableRecords.Add(newVegetableRecord1) vegetableRecords.Add(newVegetableRecord2) ... VegetableSequence.SequenceRecordSet = vegetableRecords I'm trying to recreate this in python, essentially, using the VegetableRecord and VegetableSequence imported from the dll : vegetableRecords = [] VegetableSequence = VegetableSequence() .... newVegetableRecord1 = VegetableRecord('Potato') newVegetableRecord2 = VegetableRecord('Carrot') vegetableRecords.append(newVegetableRecord1) vegetableRecords.append(newVegetableRecord2) ... VegetableSequence.SequenceRecordSet = vegetableRecords That fails with an error that is essentially: TypeError: 'list' value cannot be converted to System.Collections.Generic.ICollection`1[VegetableRecord] Any advice? Thanks! - Jesse

1 1

Doubt about compatibility between Python version and Pythonnet
by Alvaro Castro, Fernando 25 Apr '23

25 Apr '23

Hello, I contact you because we are doing some tests using Python 3.10 and Python 3.8. We have seen that using Python 3.8 we can install pythonnet 2.5.2, but using Python 3.10 pythonnet 2.5.2 installation failed. In the information of Pythonnet it seems that 2.5.2 can be installed with Python versions between 3.7 and 3.11. Can you help me with this please? Is there any manner or procedure to install this specific pythonnet version with Python 3.10? Thank you in advance. Fernando. This message contains information that may be privileged or confidential and is the property of the Capgemini Group. It is intended only for the person to whom it is addressed. If you are not the intended recipient, you are not authorized to read, print, retain, copy, disseminate, distribute, or use this message or any part thereof. If you receive this message in error, please notify the sender immediately and delete all copies of this message.

2 1

import failing help needed
by Mark A Gregory 11 Feb '23

11 Feb '23

Windows 11. Visual Studio 2022. Python311 install and working using VSCode. Pythonnet installed using VS 2022 nuget and pip3 in command prompt I have this code and it is failing at import pyproj - error is no _socket Help appreciated public AzimuthBoundingBoxCalculator() { string? GetPythonLib() { if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX)) { return "/Library/Frameworks/Python.framework/Versions/3.11/lib/libpython3.11.dylib"; } if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) { return @"C:\Users\basic\AppData\Local\Programs\Python\Python311\python311.dll"; } if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux) || RuntimeInformation.IsOSPlatform(OSPlatform.FreeBSD)) { return "libpython3.11.so"; } return null; } string pythonDll = GetPythonLib(); Runtime.PythonDLL = pythonDll; Environment.SetEnvironmentVariable("PYTHONNET_PYDLL", pythonDll); PythonEngine.Initialize(); _gilState = Py.GIL(); using (Py.GIL()) { dynamic pyproj = Py.Import("pyproj"); _geod = pyproj.Geod(ellps: "WGS84"); } } Regards Mark Gregory

1 0

python3-pythonnet in Yocto project
by egyszeregy＠freemail.hu 03 Dec '22

03 Dec '22

In Yocto project python3-pythonnet module is available from now, feel free to use for any embedded Linux image build. https://layers.openembedded.org/layerindex/recipe/327446/

1 0

Release 3.0.0
by Benedikt Reinartz 29 Sep '22

29 Sep '22

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

1 0

Pythonnet causes Exception has occurred: "TypeLoadException" when running .net dll on linux
by Hossam Alzomor 27 Sep '22

27 Sep '22

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]

1 0

Problem with importing twice (PythonNet)
by Bodurov Daniel (RBBG/ENG23) 30 Aug '22

30 Aug '22

Hello PythonNet Developers, I have a problem with running scripts in sequence in my C# Unit Tests. When I run my test alone it works perfectly, but when I run all my tests, one specific test fails with Memory Access Violation Error. This specific test is a test with 2 script imports or 2 scripts compilations. string Script1 = "plain_tests.py"; string Script2 = "fitting_tests.py"; PythonEngine.Initialize(); var script1 = new Script(Script1); script1.Execute(); var script2 = new Script(Script2); script2.Execute(); Where: public class Script { public string Filename { get; private set; } private PyObject Compiled; public PyScope Scope; public Script(string filename) { Filename = filename; var content = File.ReadAllText(filename); var py_lock = PythonEngine.AcquireLock(); Compiled = PythonEngine.Compile(content, filename, RunFlagType.File); PythonEngine.ReleaseLock(py_lock); Reset(); } public void Execute() { var py_lock = PythonEngine.AcquireLock(); Scope.Execute(Compiled); PythonEngine.ReleaseLock(py_lock); } public void Reset() { var py_lock = PythonEngine.AcquireLock(); Scope = Py.CreateScope(); PythonEngine.ReleaseLock(py_lock); } } The place it fails is on script2.Execute(); Scope.Execute(Compiled) fails on the seconds script. But this only happens when running all 10 unit tests. When running only this one specific test alone - there is no problem. The issue occurs both from direct python function calling from Imported script and from this way I presented - compiling and executing script. Do you have any idea how to solve this issue with sequential testing? I really need your help.. I have been trying to solve this for 3 weeks now. I am really really stuck. Thanks in advance! Best regards, Daniel Bodurov

1 0

convert python.runtime.pyobject to .net datatype
by anilshrirao＠gmail.com 23 Jul '22

23 Jul '22

Hi, Does anyone know how to convert the pyobject dataype to .net datatype? I need to send the image from python to .net code. Thanks,

1 0

TypeError: No method matches given arguments for SetContext: (<class 'int'>)
by Steven Manross 14 Jul '22

14 Jul '22

I got my initial code working on the C DLL and it's creating snapshot sets as I want. I am now having a problem with a function to query ALL the snapshots. This value can be sent to SetContext() In [39]: alphavsslib.VssSnapshotContext.All Out[39]: 4294967295 4294967295 = 0xFFFFFFFF A sample of the call is here: https://github.com/alphaleonis/AlphaVSS-Samples/blob/8482e83dd13cb8467860e8… # this is the declaration of SetContext virtual void SetContext(VssSnapshotContext context); This is the declaration for All: VssSnapshotContext.All = 0xFFFFFFFF https://github.com/alphaleonis/AlphaVSS/blob/13462e657f7993da5c80f835d219bb… However, this line results in a Type error In [40]: ctx = cmp.SetContext(alphavsslib.VssSnapshotContext.All) --------------------------------------------------------------------------- TypeError Traceback (most recent call last) Input In [40], in <cell line: 1>() ----> 1 ctx = cmp.SetContext(alphavsslib.VssSnapshotContext.All) TypeError: No method matches given arguments for SetContext: (<class 'int'>) I've tried converting the value using: ctx = cmp.SetContext(System.Convert.ToUInt32(alphavsslib.VssSnapshotContext.All)) *And* ctx = cmp.SetContext(ctypes.c_uint32(alphavsslib.VssSnapshotContext.All).value) but the same error occurs I can get the function to succeed (albeit it doesn't show me what I want) with this: cmp.SetContext(ctypes.c_int32(alphavsslib.VssSnapshotContext.All).value) ... because ctypes.c_int32(alphavsslib.VssSnapshotContext.All).value = -1 I believe it's possible that this could be related to the link below but I can't be sure because I am not a C developer and I can't determine how this was fix from the notes in the link. Granted, the author is on CentOS, and I'm on Windows... but the backstory behind the issue sounds like it's related. https://github.com/pythonnet/pythonnet/issues/950 I'm currently running on pythonnet 2.5.2 and Python 3.9.13 (tags/v3.9.13:6de2ca5, May 17 2022, 16:36:42) [MSC v.1929 64 bit (AMD64)] on win32 Any thoughts or suggestions would be greatly appreciated. Steven

2 2