Mailman 3 April 2017 - Python.NET

.NET Core support
by Mark Traudt 14 Sep '17

14 Sep '17

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 17 Aug '17

17 Aug '17

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 27 Jun '17

27 Jun '17

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 21 Jun '17

21 Jun '17

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 21 May '17

21 May '17

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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Reloading modules
by Evan Davey 16 Apr '17

16 Apr '17

Hi, I am using Python.Net <http://python.net/> embedded inside an application. The application allows me to select and run a python file (which then allows me to use Python to access that application's C# SDK). string code; using (var streamReader = new StreamReader(scriptFile, Encoding.UTF8)) { code = streamReader.ReadToEnd(); } using (Py.GIL()) { PythonEngine.Exec(code); } This works, except when the code imports a python module I have to quit and restart the application in order for the import to reflect any code changes (which is very slow for debugging). How can I reload or reset the PythonEngine before running the code? Cheers, Ebam

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first pythonnet related job
by Denis Akhiyarov 14 Apr '17

14 Apr '17

Hi all, First pythonnet + Qt contract job posted in London yesterday. Feel free to forward to interested people. https://www.reqiva.com/jobs/6006715/contract-software-engineer.asp I honestly have no idea why they need pythonnet from C++/CLI. My client specialise in high resolution image processing and require a Software Engineer to provide expertise around Python/C API and C++. The client has a Qt/C++ desktop application. To allow users (both internal and customers) maximum flexibility with the instrument, they are looking to expose an API for hardware control and data access/analysis. The language of choice for most of their users is Python and they have chosen to expose their internal API to C++/CLI (.NET) which can be called from Python using pythonnet. Python scripts can be called from a simple console widget in our C++/Qt application or can be run externally through a python console of choice. Key skills needed: - C++ - Python /C API Nice to have skills: - QT - OpenGL - C# Contact Details:Reqiva Ltd <https://www.reqiva.com/companies/reqiva-ltd> Tel: 01189 595552 Contact: Craig Turner Email: c.turner(a)reqiva.com

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Webinar about Python for .NET
by Denis Akhiyarov 07 Apr '17

07 Apr '17

Michael Kennedy is going to give a webinar about Python for .NET developers: https://www.wintellect.com/software-development-training/register/webinar/41

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