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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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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github migration
by davidacoder Jan. 16, 2014

Jan. 16, 2014

Alright, I started this now. I created the github organization and the repo. I will also have a stab at migrating the svn history. I've marked the github repo as experimental for now so that it is clear that at this point it is not the official source (yet). I'll keep the list updated as I make progress. Cheers, David From: PythonDotNet [mailto:pythondotnet-bounces+davidacoder=hotmail.com@python.org] On Behalf Of Tony Roberts Sent: Wednesday, November 27, 2013 6:04 AM To: pythondotnet(a)python.org Subject: Re: [Python.NET] PTVS and python.NET Hi David, that would seem to fit with the way most other projects work, and should make it easier for anyone looking for the project on github to find it. I'm happy to help out with the migration and maintenance if it is decided to go ahead with this. The fork I created doesn't have the history from svn, so I think it would be better to start again with the sourceforge project and pull it into git with all the history and then merge in the various changes already in github. cheers, Tony On Wed, Nov 27, 2013 at 3:21 AM, davidacoder <davidacoder(a)hotmail.com <mailto:davidacoder@hotmail.com> > wrote: I guess my preferred option would be to create a github organization and host the repo there. So something like github.com/pythonnet/pythonnet <http://github.com/pythonnet/pythonnet> . In that case the organization can have multiple owners, so the whole thing is also less dependent on one person. If, on the other hand, one of the original maintainers wanted to host it under their account, I would also understand that, i.e. if this is really someone's baby. Finally, I guess the official short name is "pythonnet", right? Or "pythondotnet", like the mailing list alias? Cheers, David From: Tribble, Brett [mailto:btribble@ea.com <mailto:btribble@ea.com> ] Sent: Tuesday, November 26, 2013 5:36 PM To: davidacoder; pythondotnet(a)python.org <mailto:pythondotnet@python.org> ; brian.lloyd(a)revolution.com <mailto:brian.lloyd@revolution.com> Subject: RE: [Python.NET] PTVS and python.NET So, who is willing to be the primary maintainer of the github repository? I think we should wait for a little while to see if Brian or Barton respond. I see that tiran has a github account as well: https://github.com/tiran From: PythonDotNet [mailto:pythondotnet-bounces+btribble=ea.com@python.org] On Behalf Of davidacoder Sent: Tuesday, November 26, 2013 6:37 AM To: pythondotnet(a)python.org <mailto:pythondotnet@python.org> Subject: Re: [Python.NET] PTVS and python.NET Great idea! Best, David From: PythonDotNet [mailto:pythondotnet-bounces+davidacoder=hotmail.com@python.org] On Behalf Of John Gill Sent: Tuesday, November 26, 2013 7:47 AM To: pythondotnet(a)python.org <mailto:pythondotnet@python.org> Subject: [Python.NET] PTVS and python.NET Related to a move to github, I have been in touch with the maintainer of PTVS asking if they are aware of this project. It seems such a natural fit. He would be happy to: 1. Put a link on our "Related projects" page 2. Identify some interesting scenarios and do a blog post 3. Add a dedicated doc page 4. Etc. Subject to: 1. The project is actively maintained 2. Up to date docs 3. It "works" a. Reliable & robust b. Works with PTVS (eg PTVS doesn't crash, .) It would be great if PTVS was able to install python .NET for people (the current install process "copy these dll's" is simple and effective, but a direct install from PTVS would be good. I think we would need to resolve the current situation with the code split between github and sourceforge before we could get the endorsement from PTVS. 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 <mailto:postmaster@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. ****************************************** _________________________________________________ Python.NET mailing list - PythonDotNet(a)python.org <mailto:PythonDotNet@python.org> https://mail.python.org/mailman/listinfo/pythondotnet

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pip and wheel
by davidacoder Nov. 29, 2013

Nov. 29, 2013

Hi, I think one major barrier for easier adoption of pythondotnet right now is setup, i.e. how you get to a point where you can just use it. I think there are a couple of issues: - the download page on sourceforge is confusing. There are five folders on the first page that don't seem to follow some common naming scheme. Three have a pythonnet version in it, one doesn't have any version in the name and the last one refers to a CLR version. If I land there I just don't know what to do next. - There doesn't seem to be a win x64 download, which I would assume to be the major version in use right now. - In general the builds seem to be old - There don't seem to be mono builds (although, should there be?) At the same time I feel that with the new package stuff happening in the general python world the idea of having a binary zip file download is getting old in any case. One potentially elegant way around this is to provide binary wheels for pythondotnet that are hosted on pypi.python.org for windows. I don't know how the mono stuff would work and multi-platform things, though. In any case, I think it should be feasible at that point to simply use pip to install pythondotnet: pip install pythondotnet and that would do the trick. And now that pip is bundled in the default python distribution, I feel that would essentially solve the distribution problem completely, right? I think such a pip install should just make the clr module available for import. I am less sure whether such a wheel install should also put npython.exe somewhere onto the path (scripts folder?). Thoughts? Thanks, David

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unsubscribe
by 邢富坤 Nov. 28, 2013

Nov. 28, 2013

unsubscribe

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Mailinglist config
by davidacoder Nov. 27, 2013

Nov. 27, 2013

Who controls the mailing list settings? Is there a way to set things up such that the default reply-to address is pythondotnet(a)python.org <mailto:pythondotnet@python.org> , and not the email of the person one is replying to? I've gotten three responses to emails in the last three days to my emails that were clearly meant to reach everyone but were only sent to me, presumably because people just hit "reply". I guess that many more answers to emails on this list never actually reach the list due to this setting :) Cheers, David

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PTVS and python.NET
by John Gill Nov. 27, 2013

Nov. 27, 2013

Related to a move to github, I have been in touch with the maintainer of PTVS asking if they are aware of this project. It seems such a natural fit. He would be happy to: 1. Put a link on our "Related projects" page 2. Identify some interesting scenarios and do a blog post 3. Add a dedicated doc page 4. Etc. Subject to: 1. The project is actively maintained 2. Up to date docs 3. It "works" a. Reliable & robust b. Works with PTVS (eg PTVS doesn't crash, ...) It would be great if PTVS was able to install python .NET for people (the current install process "copy these dll's" is simple and effective, but a direct install from PTVS would be good. I think we would need to resolve the current situation with the code split between github and sourceforge before we could get the endorsement from PTVS. 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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Re: [Python.NET] Moving the project to github
by davidacoder Nov. 26, 2013

Nov. 26, 2013

+1 on that! I would love to see the official code base move to git and ideally github.com. The current situation, with an official very inactive repository and forks that are more current is really not good for the project. I also simply think that if the project was on github it would be easier to find people to contribute. I guess the main question is whether the three maintainers of the official project think this is a good idea, and if yes, then to do the migration. I'd be happy to help with the latter. Best, David From: PythonDotNet [mailto:pythondotnet-bounces+btribble=ea.com at python.org] On Behalf Of John Gill Sent: Tuesday, November 12, 2013 5:29 AM To: pythondotnet at python.org Subject: [Python.NET] Moving the project to github As has been mentioned on the list here, Tony Roberts' version in github is currently the most actively maintained version of python dot net: https://github.com/renshawbay/pythonnet/ As I understand things, the original author, Brian Lloyd is still active in the project, but has less time to work on it than previously. It would be good if work could consolidate on a single source base. I think moving to github would help with that, certainly makes merging Tony's changes with the official release easier. This is a really useful project, I am finding it wonderful to be able to use .NET and cpython seamlessly + it would be good not to fragment the user base by having multiple versions of the code. 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 at tokiomillennium.com<mailto:postmaster at 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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Moving the project to github
by John Gill Nov. 12, 2013

Nov. 12, 2013

As has been mentioned on the list here, Tony Roberts' version in github is currently the most actively maintained version of python dot net: https://github.com/renshawbay/pythonnet/ As I understand things, the original author, Brian Lloyd is still active in the project, but has less time to work on it than previously. It would be good if work could consolidate on a single source base. I think moving to github would help with that, certainly makes merging Tony's changes with the official release easier. This is a really useful project, I am finding it wonderful to be able to use .NET and cpython seamlessly + it would be good not to fragment the user base by having multiple versions of the code. 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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Python for .net and python 3.2
by Kieran Love Nov. 10, 2013

Nov. 10, 2013

I've downloaded "pythonnet-2.0-Beta0-clr4.0_140_py27_UCS2_x86.zip" and unzipped its contents to my python32/DLLs folder. Then when I try to use it I get the following error:- >>> import clr Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: dynamic module does not define init function (PyInit_clr) Three questions: 1. I'm assuming this release was for use with .net4 and python version 2.7, is that correct? 2. Is there an official release of python for .net that works with python 3.2? Currently I'm using these beta builds (http://www.pyxll.com/pythonnet/) that I found from reading the mailing lists. 3. Is there a different reason why my python code example isn't working with the official release? Thanks for your time. ********************************************************************************************** Important Note This email (including any attachments) contains information which is confidential and may be subject to legal privilege. If you are not the intended recipient you must not use, distribute or copy this email. If you have received this email in error please notify the sender immediately and delete this email. Any views expressed in this email are not necessarily the views of IRESS Limited. It is the duty of the recipient to virus scan and otherwise test the information provided before loading onto any computer system. IRESS Limited does not warrant that the information is free of a virus or any other defect or error. **********************************************************************************************

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Python.NET

November 2013