Mailman 3 March 2014 - 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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pip install prerelease versions
by David Anthoff March 24, 2014

March 24, 2014

Hi everyone, if you are on Python 2.7 and Windows you can try to install a nightly snapshot of Python.Net via pip: pip install --pre pythonnet Make sure you have a recent version of pip installed (http://www.pip-installer.org/en/latest/installing.html). This is VERY experimental and the version you will get is just a nightly snapshot of the current source on github. It should work on Windows 8.1, though. Please report back any problems or success of this. The current plan is still to release a stable version 2.0 at some point. The major thanks for the progress so far goes to Tony, who has contributed most of the code changes to make this work. Best, David

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DocStringAttribute Example
by Jonno March 18, 2014

March 18, 2014

Hi, Is there an example how to format documentation in classes & methods so that a python docstring will be produced? I found the following in a thread a while back but it's not working for me: ### test.cs ## using System; using System.Runtime.InteropServices; using Python.Runtime; namespace PinvokeTest { [DocStringAttribute("Interface class to external functions.")] public class Invoke { [DocStringAttribute("External funtion simulation: WriteToFile(char) will write a char to the terminal.")] public static void WriteToFile(char arg) { Console.WriteLine("Writing {0}", arg); return; } } }

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Re: [Python.NET] Python .NET on Windows 8.1
by davidacoder March 14, 2014

March 14, 2014

I had the same problem and the following fix in the file runtime/assemblymanager.cs made things work for me. I believe the problem is that on Win 8.1 there seem to be generic types that aren't in a namespace. My patch just skips those and thus prevents a crash. I am not sure whether that is the right way to handle it, but it does fix the crash. Best, David diff --git a/pythonnet/src/runtime/assemblymanager.cs b/pythonnet/src/runtime/assemblymanager.cs index 80c838d..2d369b5 100644 --- a/pythonnet/src/runtime/assemblymanager.cs +++ b/pythonnet/src/runtime/assemblymanager.cs @@ -283,7 +283,7 @@ internal class AssemblyManager { namespaces[ns].Add(assembly, String.Empty); } - if (t.IsGenericTypeDefinition) { + if (ns !=null && t.IsGenericTypeDefinition) { GenericUtil.Register(t); } } From: PythonDotNet [mailto:pythondotnet-bounces+btribble=ea.com at python.org] On Behalf Of Mihhail Maslakov Sent: Wed Nov 6 11:27:45 CET 2013 To: pythondotnet at python.org Subject: [Python.NET] Python .NET on Windows 8.1 I have been using python.net for about 5 years for my project at work. Usually everything worked or at least there was a way to fix it. Right now, there is a situation, that I cannot understand. Since my PC got upgraded from W7 to W8.1 imports stopped working. It seems that something happens on clr module initialization stage, because when I try clr.AddReference("...") python answers: "AttributeError: 'module' object has no attribute 'AddReference'" When debugging with freshly built clr.pyd/Python.Runtime.dll I see that Runtime.Initialize() finishes without exception and clr module methods are added via InitializeModuleMembers(). Yet still, when I run my program clr doesn't work properly and seems like import hooks are not there (breakpoints at AddReference and other methods are not fired). Do you have any pointers for me in this situation? Thank you, Mihhail Maslakov

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