BERJAYA

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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Invoking a C# method with a python list
by Mohamed Koubaa Sept. 24, 2018

Sept. 24, 2018

Hello, I am using the 2.3 release branch. I have C# code like this: public class A { public A() {...} } public class B { public B() {...} public static void Func(IEnumerable<A> input){ } } I want to pass in a python list to Func but get this error: >>> b=B() >>> b.Func([A(), A()]) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: No method matches given arguments I tried both IEnumerable and IList in the signature of 'Func'. I know that I can import System and create some .NET collection type and it works well. Did I miss anything? Is this usage pattern within the design goals of pythonnet? I assume this would have to be fixed in MethodBinder but I wanted to try asking here first. Thanks! Mohamed Koubaa

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Python.Net crash on assembly reload in Unity
by Viktoria Kovecses Aug. 9, 2018

Aug. 9, 2018

Hello, We are experiencing crashes when running Python.Net in the Unity 2018.2 game engine. Specifically, after modifying a C# script in Unity, an automatic reload is triggered which results in a crash in Py_Finalize. Here are the repro steps: 0. Make sure to call PythonEngine.Shutdown on domain unload (otherwise it crashes earlier). 1. Create a Unity project and add the compiled Python.Net files (clr.pyd and Python.Runtime.dll) to the Assets folder 2. In Unity Player Settings (Edit > Project Settings > Player), under "Other Settings", make sure "Api Compatibility Level" is set to ".NET 4.x", and "Scripting Runtime Version" is set to ".NET 4.x Equivalent" 3. In Assets, create the following C# script (HelloWorld.cs): ``` using UnityEditor; using UnityEngine; using Python.Runtime; class HelloWorld { [MenuItem("Python/Hello")] public static void CallHello() { using (Py.GIL()) { string script = "import clr\n" + "clr.AddReference('UnityEngine.dll')\n" + "import UnityEngine\n" + "UnityEngine.Debug.Log('hello world!')\n"; PythonEngine.Exec(script); } } } ``` 4. Run the script by selecting Python > Hello from the top menu --> This will log "hello world!" to the Unity console 5. Modify HelloWorld.cs script: change Hello to Hello 1 and trigger hot reloading of assemblies 6. run Python > Hello 1 --> Logs in the console 7. Modify HelloWorld.cs script: change Hello 1 to Hello 2: --> crash in dict_traverse (garbage collection during Py_Finalize). Does anyone know what could be causing the crash and/or how to fix it? Any help is appreciated. Thank you, Viktoria

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PythonNet vs built-in functions
by Andrei Faber July 28, 2018

July 28, 2018

Hello, How do I call a _built-in_ function using PythonNet, for instance dir()? -- Best regards, Andrei Faber

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Fwd: Tips for Debugging?
by Alex Catarino July 27, 2018

July 27, 2018

Hi pythonnet team, I followed your tutorials ( https://github.com/pythonnet/ pythonnet/wiki/Various-debugging-scenarios-of-embedded-CPython) and I could test two out of three scenarios (I couldn't get ptvsd to work). When I tested it on Lean, I've verified that we don't get much information with the mixed-mode cross-language debugger, so I extended your example with a mock Lean algorithm: https://github.com/QuantConnect/pythonnet/tree/debug First scenario - mixed-mode cross-language debugger (attached file: mixeddebugger.png): The debugger doesn't give us the information about the object if we click/mounse over on it or inspect it in Locals/Watch. We need to know what attributes it has to access them in "Immediate Window". Second scenario - python debugger (attached file: pythondebugger.png): The debugger does show the information. The issue with the python debugger is that as we are using threads in Lean, we need to detach and reattach on every iteration in this code snippet the emulates the OnData call: Task.Factory.StartNew(() => { algorithm.Run(); }).ContinueWith((ant) => { algorithm.Initialize(); }).ContinueWith((ant) => { algorithm.OnData(DateTime.UtcNow.ToString()); algorithm.OnData(DateTime.UtcNow.ToString()); algorithm.OnData(DateTime.UtcNow.ToString()); }).Wait(); I have tried to attach the debugger in different places in the python script. If I call it in module level, breakpoints are never hit in the algorithm. If I call it in Initialize, only breakpoints in Initialize are hit. And finally, if I call it in OnData, I need to detach and reattach on every OnData call from the block above. Best regards, Alex On Wed, Jul 25, 2018 at 12:13 AM, Denis Akhiyarov <denis.akhiyarov(a)gmail.com > wrote: > I wrote a debugging tutorial using PTVS here and further improvements are > welcome! > > https://github.com/pythonnet/pythonnet/wiki/Various-debuggin > g-scenarios-of-embedded-CPython > > > On Tue, Jul 10, 2018, 2:13 AM Jared Broad via PythonDotNet < > pythondotnet(a)python.org> wrote: > >> Hello PythonNet >> >> Do you have any tips/experiences/tools for allowing debugging for a >> C#-pythonnet script? >> >> Thank you >> Jared >> >> -- >> Jared Broad >> >> www.quantconnect.com >> Phone-USA: +1 917 327 0556 >> *Democratizing Finance, Empowering Individuals* >> Facebook <http://www.facebook.com/QuantConnect> | Twitter >> <https://twitter.com/#!/QuantConnect> | LinkedIn >> <http://www.linkedin.com/company/quantconnect> | Skype: jaredbroad >> >> We're recruiting! Join us and make your mark on the future of finance >> <https://www.quantconnect.com/jobs> >> _________________________________________________ >> Python.NET mailing list - PythonDotNet(a)python.org >> https://mail.python.org/mailman/listinfo/pythondotnet >> >

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Tips for Debugging?
by Jared Broad July 24, 2018

July 24, 2018

Hello PythonNet Do you have any tips/experiences/tools for allowing debugging for a C#-pythonnet script? Thank you Jared -- Jared Broad www.quantconnect.com Phone-USA: +1 917 327 0556 *Democratizing Finance, Empowering Individuals* Facebook <http://www.facebook.com/QuantConnect> | Twitter <https://twitter.com/#!/QuantConnect> | LinkedIn <http://www.linkedin.com/company/quantconnect> | Skype: jaredbroad We're recruiting! Join us and make your mark on the future of finance <https://www.quantconnect.com/jobs>

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there are something with my computer
by LZR July 12, 2018

July 12, 2018

hello,there are something with my computer,I need your help when i run setup.py ,there are always CSC ,but i don't know how to deal with it thank you . 发自网易邮箱大师

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Python.NET

July 2018