Mailman 3 November 2016 - 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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Inheriting from abstract .NET class
by Henning Moeller Aug. 18, 2017

Aug. 18, 2017

Hello out there, I'm trying to inherit from an abstract .NET base class in Python (2.7). I'm a Python n00b but from what I understood... Here's what I managed to do in Python only and which works fine: [File: room.py] ------- import abc class Room(object): def __init__(self, door): self.door = door def open(self): self.door.open() def close(self): self.door.close() def is_open(self): return self.door.is_open() class Door(object): __metaclass__ = abc.ABCMeta def open(self): if not self.is_open(): self.toggle() def close(self): if self.is_open(): self.toggle() @abc.abstractmethod def is_open(self): pass @abc.abstractmethod def toggle(self): pass class StringDoor(Door): def __init__(self): self.status = "closed" def is_open(self): return self.status == "open" def toggle(self): if self.status == "open": self.status = "closed" else: self.status = "open" class BooleanDoor(Door): def __init__(self): self.status = True def is_open(self): return self.status def toggle(self): self.status = not (self.status) Door.register(StringDoor) Door.register(BooleanDoor) ------- Now, all I did was to replace the abstract base class Door by a C# representation: [File: PythonAbstractBaseClass.dll] ------- namespace PythonAbstractBaseClass { public abstract class Door { public virtual void Open() { if (!IsOpen()) Toggle(); } public virtual void Close() { if (IsOpen()) Toggle(); } public abstract bool IsOpen(); public abstract void Toggle(); } } ------- Removing Door from the Python part and importing it from the .NET assembly instead, I end up with this: [File: room2.py] ------- import clr import abc from PythonAbstractBaseClass import Door class Room(object): def __init__(self, door): self.door = door def open(self): self.door.open() def close(self): self.door.close() def is_open(self): return self.door.is_open() class StringDoor(Door): def __init__(self): self.status = "closed" def is_open(self): return self.status == "open" def toggle(self): if self.status == "open": self.status = "closed" else: self.status = "open" class BooleanDoor(Door): def __init__(self): self.status = True def is_open(self): return self.status def toggle(self): self.status = not (self.status) Door.register(StringDoor) Door.register(BooleanDoor) ------- But this fails with the following error message: Door.register(StringDoor) AttributeError: type object 'Door' has no attribute 'register' >From what I understood about abc.ABCMeta, this metaclass contributes the 'register' method. It seems that abstract C# classes do not come with the same metaclass. They instead come with metaclass "CLR Metatype" which obviously does not provide 'register'. But if I drop the call to 'register', on instantiating one of the derived classes, I receive the error message sdoor = StringDoor() TypeError: cannot instantiate abstract class Is there a way to inherit from an abstract .NET class or is this is missing feature? Thanks in advance, Henning

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PythonNet on Cygwin
by Nikhil Garg June 21, 2017

June 21, 2017

Hi Guys, I was wondering if anyone knows how to make Python for .Net work on cygwin installation of python. I have been looking around and find a mixed bag of information. If anyone knows of the working version of Python for .Net and its dependency, I would appreciate if you could share it with me. Currently, I am using a generic windows version and it works just fine, but I need it to work on Cygwin version of python. I appreciate any helpful replies. Thanks, Nikhil

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cx_freeze and python.net
by Boris Burdin May 22, 2017

May 22, 2017

Hello everybody, I'm trying to build a python.net application using cx-freeze . Once the application is built, I put in my final folder the Python.Runtime.dll. but it stil doesn't seem to work . Actually, when I run the .exe file, nothing is happening. So, I wonder if there were something else to do, another dll to put in the folder, or any option to use with cx_freeze when building the application ? i would be very grateful if you could help me on this matter .. Thanks in advance, Boris

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advanced book about Python
by Denis Akhiyarov Nov. 27, 2016

Nov. 27, 2016

Hi Python and .NET developers, I would like to purchase a copy of this advanced book about Python for pythonnet contributors: https://thehackerguidetopython.com The cost of professional license to share with 50 people is 199 USD ($), but I will pay it in full if at least 10 people agree to contribute any amount towards the full cost. The book is sold for 29$ for one person. The author agreed to this deal. The author is OpenStack Project Team Leader and Technical Committee Member. [image: Inline image 1] Here is a sample chapter about functional programming, comprehensions, and generators: https://thehackerguidetopython.com/the-hacker-guide-to-python-sample.pdf Please reply to me or here if you would like to get this offer! Thanks, Denis

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Adding new attributes to .Net classes is unstable
by Torget Øystein Idema Nov. 23, 2016

Nov. 23, 2016

Hi, I have a problem with adding attributes to .Net classes being unstable. E.g. from System import TimeSpan TimeSpan.my_method = lambda self: self.TotalMinutes ts = TimeSpan.FromHours(1) ts.my_method() This code will sometimes work and other times fail with the exception 'TimeSpan' object has no attribute 'my_method'. The failure rate is variable and for some scripts/program it will work all the time while for others it will not work at all. It seems to fail a lot more often on Python 3.5 than on Python 3.4. If I look at either dir(ts) or ts.__class__.__dict__ the method is there even when the call to my_method fails. I have tried to look into the PythonNet code for clues, but as far as I can see the new attribute is registered by MetaType. tp_setattro without error, but the method is still not found. What I want to ask you is 1. Is adding new attributes to a .Net class supported behaviour or does it work more or less by accident? 2. Any pointers to how the attribute lookup is handled for .Net classes is appreciated. Currently I have not found if and where PythonNet is involved in the actual attribute lookup process. Cheers, Øystein Idema Torget

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Re: [Python.NET] surveying the landscape ...
by Denis Akhiyarov Nov. 9, 2016

Nov. 9, 2016

Hi David, Can you please give access to pythonnet on Test PyPI to me? https://testpypi.python.org/pypi/pythonnet For example 3 people have access to production PyPI installation: https://pypi.python.org/pypi/pythonnet/2.2.0.dev1 Thanks, Denis On Mon, Jun 22, 2015 at 4:50 PM, David Anthoff <anthoff(a)berkeley.edu> wrote: > I have the credentials to the pypi listing, and I uploaded the one dev > release we made. I also am an owner of the github.com/pythonnet > organization, but I think there are three other owners as well. > > > > I have moved to other projects in my work, so I won’t be making any > contributions to this project going forward. I’d obviously be happy to hand > over the pypi credentials and anything else to whoever steps up on this > project. > > > > Best, > > David > > > > *From:* PythonDotNet [mailto:pythondotnet-bounces+anthoff= > berkeley.edu(a)python.org] *On Behalf Of *Howard Mansell > *Sent:* Monday, June 22, 2015 7:01 AM > *To:* pythondotnet(a)python.org > *Subject:* Re: [Python.NET] surveying the landscape ... > > > > Hi All > > > > Would any of the past contributors be willing and able to work on the > project more actively if we at BlueMountain funded the development? We > don’t have pre-existing deep technical knowledge of the project, so > contributing directly is more difficult for us. > > > > Feel free to email me directly if you are interested. > > > > (BTW, Brett – I agree having more active support from PVTS guys would be > useful. Not sure whether they are able to contribute, though) > > > > Thanks > > Howard > > > > > > *From:* PythonDotNet [mailto:pythondotnet-bounces+ > aklein=bmcm.com(a)python.org > <pythondotnet-bounces+aklein=bmcm.com(a)python.org>] *On Behalf Of *Tony > Roberts > *Sent:* Tuesday, June 16, 2015 5:17 AM > *To:* A list for users and developers of Python for .NET > *Subject:* Re: [Python.NET] surveying the landscape ... > > > > Hi Adam, > > from my point of view it'd be great to have more people involved. I've > been doing some development, but more or less out of necessity (I enjoy > working on the project when I can, but don't really have the time to commit > to it much more than I have been unfortunately). > > > > To give you some background around why there's the renshawbay repo as well > as the main repo; Initially I created the renshawbay repo as there were > various changes I needed to make to the project while it was hosted in > sourceforge, and for me it was easier to manage that in github. I added > Python 3 support, and later some stuff around subclassing .net classes in > Python. It was then decided to move the project to github, so we created > the pythonnet repo directly from the sourceforge repo rather than fork the > renshawbay repo. The thinking back then was that we should do a 2.0 release > based off that fork, and then once that was stable look at merging in the > Python 3 work from the renshawbay fork. > > > > So, to answer your first question - pythonnet/pythonnet is the official > repo, but most new development (new features etc) has taken place on the > renshawbay/pythonnet fork in the python3 branch (which maintains support > for Python 2). > > > > There's no official roadmap that I'm aware of. There are some issues and > milestones in the github repo, but AFAIK no one is actively working on > those right now. There are only a couple of issues remaining for the 2.0 > release however. > > > > Pull requests to the official repo are reviewed and merged by the project > owners (of which I'm one). So far those have been bug fixes or changes > necessary for the 2.0 release. I keep the renshawbay fork up to date with > any commits to the main repo. > > > > For what it's worth, here's what I'm aware of that needs attention: > > - Finalizing and releasing to PyPI the 2.0 release for Python 2.x only > > - Testing and getting the renshawbay python3 branch working on > non-windows platforms (the linux build currently has problems, and I've not > tested any mac builds) > > - Merging the renshawbay python3 branch into the main pythonnet fork > > - Updating the docs > > > > If you're able to help at all that would be much appreciated. > > > > Best regards, > > Tony > > > > > > On Tue, Jun 16, 2015 at 12:08 AM Tribble, Brett <btribble(a)ea.com> wrote: > > Adam, I’m ecstatic that there’s a player out there who is making good use > of Python.net, and who would like to help contribute. Organizational and > logistical issues aside, I’m all for anything you can throw at the project! > Someone correct me if I’m wrong, but I believe Brian Lloyd has largely > yielded this project to Tony and the community. Based on Brian and Tony’s > past posts, I’m fairly sure they’ll welcome any and all contributions to > the project. > > > > It may sound sacrilegious to some, but I would love to see the PTVS ( > https://pytools.codeplex.com/) folks get involved with the project. > They’re turning out a solid product, and this fits solidly in with what > Microsoft is trying to do with PTVS, .NET Core, Azure etc. > > > > > > *From:* PythonDotNet [mailto:pythondotnet-bounces+btribble= > ea.com(a)python.org] *On Behalf Of *Brad Friedman > *Sent:* Monday, June 15, 2015 2:36 PM > *To:* A list for users and developers of Python for .NET > *Subject:* Re: [Python.NET] surveying the landscape ... > > > > I'll chime in and say the lack of these kinds of legitimate "stake-holder" > systems and responsibilities has forced me to turn away from depending my > work on this project. I still keep up on it in hopes that it will turn > around. If a legitimate player were to step up and contribute to a > responsible, active and stable future for the project, I'd likely > reconsider my stance and begin active support again. It's hard to justify > putting much into it as one guy with limited resources. It needs full > multi-platform release and development support both as a python module and > a .net embedding toolkit, both for Python 2.x and 3.x. That's a lot of > work to commit to getting set right and maintaining. > > > On Jun 15, 2015, at 3:57 PM, Adam Klein <aklein(a)bluemountaincapital.com> > wrote: > > Hello all, > > > > We are using Python.NET at BlueMountain to interface between our large > .NET code base and the cpython ecosystem for interactive, exploratory > computing. By way of background, I was a major contributor to the pandas > library for a time; my firm is behind the Deedle library ( > https://github.com/BlueMountainCapital/Deedle). > > To state the obvious, the project has proven hugely valuable. BlueMountain > has an interest in making sure the library doesn’t languish. To that end, > we’re interested in contributing to the project in terms of manpower and > possibly funding development. I’d like to get a better sense of a few > things: > > > > - is there a BDFL … is Brian Lloyd still active; or is Tony Roberts > steering the ship (being the top code contributor recently on github?) It > looks like python 3.x integration and more recent work is happening on on > renshawbay/pythonnet? Is pythonnet/pythonnet still the official repo? > > - who manages releases to PyPI? > > - is this PythonDotNet mailing list the appropriate clearinghouse for all > discussions related to the project? > > - are there other institutions that are public users of this project? > > - is there an official vision or roadmap for future releases? > > > > I see that python 3.x support looks like it’s happening on > renshawbay/pythonnet (awesome). For other wish-list items or proposed > contributions, is it best to start opening issues on the > pythonnet/pythonnet github site? How are pull requests managed? > > > > I’m also wondering if there’s any collective / documented knowledge about > the inherent limitations and pitfalls of the library and/or where > development resources are needed? > > > > Best, > > Adam > > > > > > > > _________________________________________________ > Python.NET mailing list - PythonDotNet(a)python.org > https://mail.python.org/mailman/listinfo/pythondotnet > > _________________________________________________ > Python.NET mailing list - PythonDotNet(a)python.org > https://mail.python.org/mailman/listinfo/pythondotnet > > > _________________________________________________ > Python.NET mailing list - PythonDotNet(a)python.org > https://mail.python.org/mailman/listinfo/pythondotnet >

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Fwd: New python.net questions for Nov 3 - Stack Exchange
by Denis Akhiyarov Nov. 3, 2016

Nov. 3, 2016

[image: Stack Exchange] The following item was added to your Stack Exchange "python.net" feed <http://stackexchange.com/filters/223085/python-net>. [image: Stack Overflow] How to use Python and .NET/C# to automatise Princeton Instruments LightField <http://stackoverflow.com/questions/40403221/how-to-use-python-and-net-c-to-…> I want to use Python to control a proprietary spectroscopic software (Princeton Instruments LightField). I have a Lightfield automatisation exemple using Mathlab. The exemple use .NET to control ... tagged: c# <http://stackoverflow.com/tags/c#>, python <http://stackoverflow.com/tags/python>, .net <http://stackoverflow.com/tags/.net>, matlab <http://stackoverflow.com/tags/matlab>, python.net <http://stackoverflow.com/tags/python.net> Nov 3 at 13:48 Unsubscribe from this filter <http://stackexchange.com/email/unsubscribe-filter/612770/580100982?code=7o4…> or change your email preferences by visiting your filter subscriptions page on stackexchange.com <http://stackexchange.com/users/2572505?tab=subscriptions>. Questions? Comments? Let us know on our feedback site <http://meta.stackexchange.com>. If you no longer want to receive mail from Stack Exchange, unsubscribe <http://stackexchange.com/email/manage/351691/90e653826d3d1f9e04be188afdc860…> from all stackexchange.com emails. Stack Exchange Inc. 110 William Street, 28th floor, NY NY 10038 <3

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