Mailman 3 February 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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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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Passing in null as the value for a nullable type.
by John Gill Feb. 5, 2014

Feb. 5, 2014

I am sure there is a really simple answer to this one... but so far it is eluding me. I have a class something like this: public class Foo { ... public int process_date(DateTime? mydate) { ... } } I want to call this from python using pythondotnet. Calling it like this works fine: mydate = DateTime(0) Foo().process_date(mydate) But if I try to pass in a null as the date as follows: Foo().process_date(None) I get: TypeError: No method matches given arguments Hoping there is something really obvious I am missing here. John This communication and any attachments contain information which is confidential and may also be legally privileged. It is for the exclusive use of the intended recipient(s). If you are not the intended recipient(s) please note that any form of disclosure, distribution, copying, printing or use of this communication or the information in it or in any attachments is strictly prohibited and may be unlawful. If you have received this communication in error, please return it with the title "received in error" to postmaster(a)tokiomillennium.com and then permanently delete the email and any attachments from your system. E-mail communications cannot be guaranteed to be secure or error free, as information could be intercepted, corrupted, amended, lost, destroyed, arrive late or incomplete, or contain viruses. It is the recipient's responsibility to ensure that e-mail transmissions and any attachments are virus free. We do not accept liability for any damages or other consequences caused by information that is intercepted, corrupted, amended, lost, destroyed, arrives late or incomplete or contains viruses. ******************************************

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ImportError: No module named System when running .exe created by py2exe
by Sam Ling Feb. 4, 2014

Feb. 4, 2014

Hey, Dear. I used py2exe to build .exe application for the program. When I ran the .exe , there is ImportError: No module named System. In python script , I used Python for .NET package. " from System import * from System import String " It's working properly, if running directly from the script (python2.7+win7). But it failed if running .exe created by py2exe. Could anyone help? Appreciate it very much. Sam

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github migration DONE
by David Anthoff Feb. 1, 2014

Feb. 1, 2014

Hi all, I got an ok from Brian and Barton on the github migration, so please consider https://github.com/pythonnet/pythonnet the new home for this project. Please do use the issue tracker to file your ideas, fork the project, create pull requests, test the current version etc. Hopefully we can revive this project! If you would want to volunteer with reviewing stuff etc, please let me know, I myself don't know the codebase well, so right now I'm just trying to get things moving again but it would be good if someone with more familiarity with the code would be active as well. My immediate next goal would be to release a stable version. So my sense is that we should not try to do new features, but first get something out that works again. Best, David -- David Anthoff University of California, Berkeley http://www.david-anthoff.com

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