Mailman 3 May 2017 - 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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.NET Core support
by Mark Traudt Sept. 14, 2017

Sept. 14, 2017

I see there is a project for .NET Core at https://github.com/pythonnet/pythonnet/projects/2 but it is empty. Is there any work being done on this? If not, would you accept a pull request if somebody wanted to help? Mark Traudt | Chief Technology Officer Quantifi Inc. 17 Union Pl | Floor 2 | Summit | New Jersey | 07901 Tel: +1 (908) 273-9455 [https://www.quantifisolutions.com/Data/Sites/1/media/emailsignature/horizon…]<https://www.quantifisolutions.com> [https://www.quantifisolutions.com/Data/Sites/1/media/emailsignature/web_ema…]<https://www.quantifisolutions.com> [https://www.quantifisolutions.com/Data/Sites/1/media/emailsignature/twitter…] <https://twitter.com/quantifi> [https://www.quantifisolutions.com/Data/Sites/1/media/emailsignature/linkedi…] <https://www.linkedin.com/company/quantifi-inc-> [https://www.quantifisolutions.com/Data/Sites/1/media/emailsignature/google_…] <https://plus.google.com/+Quantifisolutions-software> Notice: This email message, together with any attachments, contains information of Quantifi, Inc. (Summit, NJ, USA) that may be confidential, proprietary, copyrighted, and/or legally privileged, and is intended solely for the use of the individual or entity named in this message. If you are not the intended recipient, and have received this message in error, please immediately return this by email and then delete it.

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Inheriting from abstract .NET class
by Henning Moeller Aug. 17, 2017

Aug. 17, 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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PyScope
by WARD Steve June 27, 2017

June 27, 2017

Hi, I'm keen to use the PyScope class as I'm working to replace an IronPython interactive scripting environment in a .NET application. I read about this feature here: https://github.com/pythonnet/pythonnet/pull/381 Is this due for release soon, and is there an alternative way to create something similar to a scope with the current release 2.3.0? Thanks Steve Ward Steve Ward Senior Software Engineer Oxford Instruments ___________________________________________________________________________This e-mail is confidential and is for the addressee only. Please refer to www.oxinst.com/email-statement for regulatory information.

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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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Newbie question - does the NET DLL have to be compiled with the same compiler version as Python
by Matt Slezak May 22, 2017

May 22, 2017

I have wrapped a project and it does everything except calculate the results (blah). In Cython I know I had to compile Python add-ins with Visual Studio 2015 for Python 3.5. The NET DLL I am using was compiled with Visual Studio 2013. Could this be a problem? Or does PythonNET not care about the compiler used for DLLs? Much appreciated. Matt Slezak

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cx_freeze and python.net
by Boris Burdin May 21, 2017

May 21, 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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Using a List<Enum> with Pythonnet
by Matt Slezak May 20, 2017

May 20, 2017

I have not been able to figure out this issue - I have a C# DLL that requires a List<Enum> to be populated but it appears Pythonnet returns the integer value of the Enum which does not agree with the List<Enum> datatype. My question is posted here: PythonNET - how to put an Enum into a List? C# NET Python I believe there is some kind of workaround from other posts on StackExchange but I can't replicate that workaround. Any help would be greatly appreciated. | | | | | | | | | | | PythonNET - how to put an Enum into a List? C# NET Python I have a NET library I'm using from Python with PythonNET and can't figure out how to put an enum into a... | | | |

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System.BadImageFormatException' in Python.Runtime.dll
by Mariano Phielipp May 17, 2017

May 17, 2017

I'm running this in Visual Studio 2015 compiled in x86 mode. But I'm still getting: 'EmbeddPython.vshost.exe' (CLR v4.0.30319: EmbeddPython.vshost.exe): Loaded 'C:\Users\mjphieli\Documents\Visual Studio 2015\Projects\EmbeddPython\EmbeddPython\bin\x86\Release\Python.Runtime.dll'. Cannot find or open the PDB file. 'EmbeddPython.vshost.exe' (CLR v4.0.30319: EmbeddPython.vshost.exe): Loaded '__CodeGenerator_Assembly'. Exception thrown: 'System.BadImageFormatException' in Python.Runtime.dll 'EmbeddPython.vshost.exe' (CLR v4.0.30319: EmbeddPython.vshost.exe): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.Configuration\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll'. Symbols loaded. The program '[56912] EmbeddPython.vshost.exe' has exited with code -1 (0xffffffff). -- Best Regards, Mariano

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Fwd: [python-14] Using .NET assemblies from CPython with Python.NET --- PyHou Monthly Meetup 5/16
by Denis Akhiyarov May 12, 2017

May 12, 2017

If anyone is around Houston area, feel free to join this meetup next week! ---------- Forwarded message ---------- From: Karl Ulbrich <python-14-announce(a)meetup.com> Date: Thu, May 11, 2017 at 11:55 PM Subject: [python-14] Using .NET assemblies from CPython with Python.NET --- PyHou Monthly Meetup 5/16 To: python-14-announce(a)meetup.com Hello Pythoneers! *Denis Akhiyarov*, a core developer and experienced user of *Python for .NET (pythonnet) <https://github.com/pythonnet/pythonnet> *will present this month's talk. *Python for .NET (pythonnet) <https://github.com/pythonnet/pythonnet> *is a package that gives Python programmers nearly seamless integration with the .NET 4.0+ Common Language Runtime (CLR) on Windows and Mono runtime on Linux and OSX. Python for .NET provides a powerful application scripting tool for .NET developers. Using this package you can script .NET applications or build entire applications in Python, using .NET services and components written in any language that targets the CLR (C#, VB.NET, F#, C++/CLI). For full details, visit the Meetup page here: https://www.meetup.com/python-14/events/239189223/ *When*: Tuesday, May 16, 2017 7:00 PM *Where*: Decisio Health 3900 Essex Ln. Suite #600 Houston, TX This Meetup repeats on the 3rd Tuesday of every month. If the changes affect your plans to attend, please take a moment to update your RSVP. (You can RSVP "No" or "Yes".) You can always get in touch with me through my group profile <https://www.meetup.com/python-14/members/1467025> on Meetup. -- Please Note: If you hit "*REPLY*", your message will be sent to *everyone* on this mailing list (python-14(a)meetup.com) This message was sent by Meetup on behalf of Karl Ulbrich <https://www.meetup.com/python-14/members/1467025/> from PyHou - Houston Python Enthusiasts! <https://www.meetup.com/python-14/>. To report this message, please click here <https://www.meetup.com/report_abuse/mailing_list/80040241/> To block the sender of this message, please click here <https://www.meetup.com/members/1467025/> To unsubscribe from special announcements from your Organizer(s), click here <https://www.meetup.com/python-14/optout/?submit=true&_ms_unsub=true&email=o…> Meetup, POB 4668 #37895 NY NY USA 10163 <#m_5519597385249132822_> | support(a)meetup.com

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