Mailman 3 May 2013 - 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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Python 3 version of Python for .NET
by Tony Roberts June 3, 2013

June 3, 2013

Hi, I've made the necessary changes to the Python for .NET package for it to work with Python 3. What's the best way to get this integrated back into the main project? Can I get access to the svn repo and check it into a branch for peer review and integration? Or should I email someone a patch file? thanks, Tony

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I need to use C# list as an object for one of my controls
by Jojo Maquiling May 24, 2013

May 24, 2013

Here is the issue that i need to address: * * *# My declaration is just fine here * >>> class person(System.Object): def __init__(self,fname,lname): self.Firstname = fname self.Lastname = lname *# adding a value also goes fine. * >>> j = person('jojo','maquiling') >>> j <__main__.person object at 0x029E7C88> >>> j.Firstname 'jojo' >>> j.Lastname 'maquiling' *#but then when i use listing and print it, here comes the problem* * * >>> listing = List[person]() >>> listing <System.Collections.Generic.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] object at 0x029E7C60> >>> listing.Add(person('pepe','smith')) >>> for l in listing: print l.Firstname *Traceback (most recent call last):* * File "<pyshell#78>", line 2, in <module>* * print l.Firstname* *AttributeError: 'Object' object has no attribute 'Firstname'* * * Can any body help me on how to do this properly? Thanks and best regards, Jojo Maquiling * * * *

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missing constructor
by Uffe Kousgaard May 24, 2013

May 24, 2013

First of all, thank you for a great library. I have run into an issue of an "object" in my assembly that do not have a constructor (other than "void"). The object is called TFloatPoint and has 2 public fields x and y. At first we used this: myPoint = TFloatPoint(), but that didn't work due to lack of matching constructor. Then I replaced it with a method call that returned a TFloatPoint result and that works. But for another class, I do not currently have any methods returning such an instance. Is there any generally working method, other than creating dummy methods returning the desired class / type? I'm using this one with Python 2.7.2: pythonnet-2.0-Beta0-clr4.0_140_py27_UCS2_x86.zip Kind regards Uffe Kousgaard

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Python.NET "Glitch" Solved
by Tom Dierickx May 23, 2013

May 23, 2013

Brian, Just wanted to share something with you in case it helps the cause. I was having real trouble getting a custom assembly compiled against 4.0 framework to import. Technically, it was the open source EPPlus.dll library and I could add it fine via clr.AddReference("EPPlus") but the import step failed saying "No module named OfficeOpenXml". Here's where it gets strange ... the *exact* same source code against the *exact* same target framework 4.0 created slightly different .dll's when compiled from VS2010 vs 2012. The one compiled using Vs2010 had no problems being imported into python.net but the Vs2012 exhibited the behavior above. It turns out that there's a subtle thing going on: 1) Your ScanAssembly() method inside assemblymanager.cs iterates over all the types in the assembly to deduce namespaces and adds them to a new dictionary object (ok so far) 2) But the 2012-compiled ,dll and the 2010-compiled .dll seem to have their assembly.GetTypes() in slightly different order and your extra "if (t.IsGenericTypeDefinition) {GenericUtil.Register(t);}" piece of this ScanAssembly() method was running into some generic types w/o a namespace in the 2012-compiled .dll "sooner" than they're listed in the 2010-compiled .dll and blowing things up before any namespaces could be added To make a long story short, here's what I changed and then all worked again for me: BEFORE: if (t.IsGenericTypeDefinition) { GenericUtil.Register(t); } AFTER: if (ns != null && t.IsGenericTypeDefinition) { GenericUtil.Register(t); } By the way, I was able to compile a new "Python.Runtime.dll" and "clr.pyd" (aka, clrmodule.dll) against 4.5 using Visual Studio 2012 without any problems and load in said EPPLus.dll compiled against 4.5 within my python script. I'm not sure how robust your module is against a heavy RAM/CPU/IO load, but it's definitely intriguing to be able to tap into .NET 4.0/4.5 assemblies from python!! Cheers, Tom

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How to use python object from powershell drectly?
by Seungweon Park May 1, 2013

May 1, 2013

Hi, I'd like to call python method, or receive python object (method) directly from powershell. Is it possible using python.net? Thanks, Spark.

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