Mailman 3 অক্টোবর 2016 - Python.NET

Multithreading/multiprocessing
by Alan Macdonald 5 মে, 2025

5 মে, 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 18 আগস্ট, 2017

18 আগস্ট, 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 21 জুন, 2017

21 জুন, 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 22 মে, 2017

22 মে, 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 27 নভেম্বর, 2016

27 নভেম্বর, 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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Re: [Python.NET] Support for CLR4 .NET Remoting
by pythondotnet 24 অক্টোবর, 2016

24 অক্টোবর, 2016

> Can you provide minimal reproducible code sample for both C# and Python? Tried uploading a .zip file to GitHub but got error "We don't support that file type." Instead I put a dropbox file link in the issue. > What is the latest pythonnet version in which this works? I only ever used pythonnet-2.0-alpha2-clr2.0_131_py27_UCS2 with Python 2.7.2, where it worked when controlling my .Net 3.5-based-based GUI app. I only updated my app to .NET 4.5.2 last week, which is the first time I tried CLR4-compatible PythonDotNet with Python 2.7.12. > Are you testing this from interactive python or ipython? There are some differences between the 2 options. - Command shell: C:\Python27> python my.py > Please also open an issue on github. Done: ".NET Remoting support broken #276" > BTW, why have you not switched to WCF? - Yeah, I know, Remoting is deprecated : ( Need to learn about WCF and see what kind of pain it will cause my long-established user base. --------- Original Message --------- Subject: PythonDotNet Digest, Vol 147, Issue 18 From: pythondotnet-request(a)python.org Date: 10/21/16 10:00 am To: pythondotnet(a)python.org Send PythonDotNet mailing list submissions to pythondotnet(a)python.org To subscribe or unsubscribe via the World Wide Web, visit https://mail.python.org/mailman/listinfo/pythondotnet or, via email, send a message with subject or body 'help' to pythondotnet-request(a)python.org You can reach the person managing the list at pythondotnet-owner(a)python.org When replying, please edit your Subject line so it is more specific than "Re: Contents of PythonDotNet digest..." Today's Topics: 1. Support for CLR4 .NET Remoting (pythondotnet) 2. Re: Support for CLR4 .NET Remoting (Denis Akhiyarov) ---------------------------------------------------------------------- Message: 1 Date: Thu, 20 Oct 2016 10:38:28 -0700 From: "pythondotnet" <PythonDotNet(a)jnpcarole.com> To: pythondotnet(a)python.org Subject: [Python.NET] Support for CLR4 .NET Remoting Message-ID: <20161020103828.3e63f68611bc0deecd5a6dd5fef89a2f.fe160eb814.mailapi(a)email09.godaddy.com> Content-Type: text/plain; charset="utf-8" Does pythonnet-2.1.0 support .NET Remoting? When I try to get an interface, python 2.7 crashes: Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object. at Python.Runtime.ClassDerivedObject.ToPython(IPythonDerivedType obj) at Python.Runtime.Converter.ToPython(Object value, Type type) at Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info, MethodInfo[] methodinfo) at Python.Runtime.MethodObject.Invoke(IntPtr target, IntPtr args, IntPtr kw,MethodBase info) at Python.Runtime.MethodBinding.tp_call(IntPtr ob, IntPtr args, IntPtr kw) It's getting past these lines in my script: import clr clr.Addreference(my remoting DLL) from MyNamespace import * and choking on a static method in my app's remoting DLL call which returns the interface. Through logging, I can tell that the code in that static method call is successfully executing: (IMyInterface)Activator.GetObject(typeof(IMyInterface), url); and returning the object back to Python. This worked fine before when my app targeted .NET 3.5 and I used the CLR2 version of the Python for .NET package. Now my app targets .NET 4.5.2 so I: - Updated to Python 2.7.12 - Updated the copy of my app's remoting DLL in c:\python27\dll - Removed the old Python for .NET package - Executed "pip install pythonnet", which gave me version 2.1.0. In C:\Python27\Lib\site-packages\ I see: clr.pyd Python.Runtime.dll v 2.0.0.2 Python.Runtime.dll.config

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Support for CLR4 .NET Remoting
by pythondotnet 20 অক্টোবর, 2016

20 অক্টোবর, 2016

Does pythonnet-2.1.0 support .NET Remoting? When I try to get an interface, python 2.7 crashes: Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object. at Python.Runtime.ClassDerivedObject.ToPython(IPythonDerivedType obj) at Python.Runtime.Converter.ToPython(Object value, Type type) at Python.Runtime.MethodBinder.Invoke(IntPtr inst, IntPtr args, IntPtr kw, MethodBase info, MethodInfo[] methodinfo) at Python.Runtime.MethodObject.Invoke(IntPtr target, IntPtr args, IntPtr kw,MethodBase info) at Python.Runtime.MethodBinding.tp_call(IntPtr ob, IntPtr args, IntPtr kw) It's getting past these lines in my script: import clr clr.Addreference(my remoting DLL) from MyNamespace import * and choking on a static method in my app's remoting DLL call which returns the interface. Through logging, I can tell that the code in that static method call is successfully executing: (IMyInterface)Activator.GetObject(typeof(IMyInterface), url); and returning the object back to Python. This worked fine before when my app targeted .NET 3.5 and I used the CLR2 version of the Python for .NET package. Now my app targets .NET 4.5.2 so I: - Updated to Python 2.7.12 - Updated the copy of my app's remoting DLL in c:\python27\dll - Removed the old Python for .NET package - Executed "pip install pythonnet", which gave me version 2.1.0. In C:\Python27\Lib\site-packages\ I see: clr.pyd Python.Runtime.dll v 2.0.0.2 Python.Runtime.dll.config

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Python for .NET advantages
by Simunic,Kresimir 18 অক্টোবর, 2016

18 অক্টোবর, 2016

Hello all, I have Python script that basically has 3 functions, two of them I am calling only once in beginning, and one function I call regularly let's say every second. All functions are of type to have some parameters and give back result without some state being saved between call. I realized this calls using Python for .NET. But, now I ask myself if I have any real advantage comparing scenario in which I would call python interpreter from C# program directly, then python program would store result in txt file and I would read it from C# program. Can someone tell me what would be disadvantage of such approach ? Ok, I can imagine parameter transfer is more complicated, exception handling probably also, maybe python also would need more time to perform this functions because of some initialization methods that it would have to repeat each time python interpreter is called ? Thanks, Regards. Kresimir Simunic. -- [cid:k2016_email_footer_200x78.jpg] Reifenh?user Reicofil GmbH & Co. KG Spicher Stra?e 46, 53844 Troisdorf, Germany Registergericht Siegburg, Reg.Nr. HR A 4534 USt-IdNr. DE 814359351, Steuer-Nr. 5220/5760/0426 Reifenh?user Reicofil Verwaltungs-GmbH Registergericht Siegburg, Reg.Nr. HR B 788 Gesch?ftsf?hrer: Dr.-Ing. Bernd Kunze Please note: This message may contain information which is privileged, confidential and proprietary.

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PythonEngine.ImportModule(..)
by Simunic,Kresimir 18 অক্টোবর, 2016

18 অক্টোবর, 2016

Hello, When using PythonEngine.ImportModule(..) function, the function returns NULL meaning there was some Exception during import. Is there a way to get description of this Error ? Could you point me to good manual and examples for using Python for .NET ? Thank you, Kresimir Simunic. [cid:k2016_email_footer_200x78.jpg] Reifenh?user Reicofil GmbH & Co. KG Spicher Stra?e 46, 53844 Troisdorf, Germany Registergericht Siegburg, Reg.Nr. HR A 4534 USt-IdNr. DE 814359351, Steuer-Nr. 5220/5760/0426 Reifenh?user Reicofil Verwaltungs-GmbH Registergericht Siegburg, Reg.Nr. HR B 788 Gesch?ftsf?hrer: Dr.-Ing. Bernd Kunze Please note: This message may contain information which is privileged, confidential and proprietary.

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Referencing a DLL
by Artem Zhukov 18 অক্টোবর, 2016

18 অক্টোবর, 2016

Hello all, please help me to resolve the following problem. I was trying a lot of things (see 1) and still didn't get it. There is also a project on freelancer for that (see 2): 1. http://stackoverflow.com/questions/40037684/adding-reference-to-net-assembl… 2. https://www.freelancer.com/contest/Write-some-Software-867914.html -- ARTEM ZHUKOV | HVAC/Mech.Engineer | Building Performance Engineer | Sustainability Engineer | HVAC TPM | M: +420 774 081 898

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