Mailman 3 April 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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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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Importing .NET assembly with "." (dot) in the name
by Mikhail Karmyshev April 30, 2013

April 30, 2013

Hello, Sorry for possibly dumb question, but is it possible to import an assembly with "." (dot) in the name ? Without dot, for example "SlimDX.dll" - AddReference works and import works too. But for "Accord.Imaging.dll" - AddReference is OK, but import fails: >>> import Accord.Imaging Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named Accord Is there a workaround for this or am I doing something wrong? Any help appreciated. Mikhail

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A question about pythonnet + pyinstaller
by Jeremy Chiu April 30, 2013

April 30, 2013

Hi All, So, the issue I'm running into is in combining pyinstaller with pythonnet. I'll describe my current situation. Hopefully it isn't too long and you have some insight. I have a little bit of UI put together via Windows forms. I can run it fine via pythonnet by doing "clr.AddReference('System.Windows.Forms')" to load the assembly, doing "from System.Windows.Forms import Application" to get at the Application class so I can do Application.Run(myform), and by adding the location of my little UI dll to the python path and importing classes I need from there. I can also happily do all this after building everything into an exe via pyinstaller. I did have to jump thru a few pyinstaller hoops to add my little dll to the package pyinstaller builds as well as Python.Runtime.dll. The path to the location where those are added is appended to pythonpath auto-magically by pyinstaller so they're found just fine. So then I found that I needed to get at System.ComponentModel.BindingList and System.Drawing.Bitmap. I thought all I'd have to do would be "clr.AddReference('System')" and "clr.AddReference('System.Drawing')" and then import BindingList from System.ComponentModel and Bitmap from System.Drawing. This worked fine when running from pure python but was unhappy running from the pyinstaller-built exe. In the exe it complains that it can't import BindingList (or Bitmap if I comment out BindingList). I can make it work in the exe if I use a direct import instead of a 'from' style import. So if I do "import System.ComponentModel.BindingList" instead of "from System.ComponentModel import BindingList" it works. However I don't think I should have to do a direct import and doing so gives me problems in the pure python world. I actually don't even understand how the System.Windows.Forms assembly is found in the exe scenario. I don't add the System.Windows.Forms.dll to the package that pyinstaller builds and yet it works just fine which implies that it is being found elsewhere but I don't understand how (nor why it doesn't find the other assemblies that I also want). Sorry for the long email. Hopefully you have some insight. Hopefully you know what pyinstaller is so that the majority of this email makes some sense =p Thanks for any leads you can provide, Jeremy

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Fwd: A question about pythonnet + pyinstaller
by Jeremy Chiu April 30, 2013

April 30, 2013

Hi All, So, the issue I'm running into is in combining pyinstaller with pythonnet. I'll describe my current situation. Hopefully it isn't too long and you have some insight. I have a little bit of UI put together via Windows forms. I can run it fine via pythonnet by doing "clr.AddReference('System.Windows.Forms')" to load the assembly, doing "from System.Windows.Forms import Application" to get at the Application class so I can do Application.Run(myform), and by adding the location of my little UI dll to the python path and importing classes I need from there. I can also happily do all this after building everything into an exe via pyinstaller. I did have to jump thru a few pyinstaller hoops to add my little dll to the package pyinstaller builds as well as Python.Runtime.dll. The path to the location where those are added is appended to pythonpath auto-magically by pyinstaller so they're found just fine. So then I found that I needed to get at System.ComponentModel.BindingList and System.Drawing.Bitmap. I thought all I'd have to do would be "clr.AddReference('System')" and "clr.AddReference('System.Drawing')" and then import BindingList from System.ComponentModel and Bitmap from System.Drawing. This worked fine when running from pure python but was unhappy running from the pyinstaller-built exe. In the exe it complains that it can't import BindingList (or Bitmap if I comment out BindingList). I can make it work in the exe if I use a direct import instead of a 'from' style import. So if I do "import System.ComponentModel.BindingList" instead of "from System.ComponentModel import BindingList" it works. However I don't think I should have to do a direct import and doing so gives me problems in the pure python world. I actually don't even understand how the System.Windows.Forms assembly is found in the exe scenario. I don't add the System.Windows.Forms.dll to the package that pyinstaller builds and yet it works just fine which implies that it is being found elsewhere but I don't understand how (nor why it doesn't find the other assemblies that I also want). Sorry for the long email. Hopefully you have some insight. Hopefully you know what pyinstaller is so that the majority of this email makes some sense =p Thanks for any leads you can provide, Jeremy

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Using embedded structs
by Morne Joubert April 30, 2013

April 30, 2013

Hi, I am new at Paython and Python.NET and have been trying to use my own .NET assemblies. I have been able to get going with mostly but cannot get passed using C# structs. I have a class with an embedded struct public class Log { public class PageManager { public struct Page { public long byteEnd; public long byteStart; public int indexEnd; public int indexStart; public long timestampTick; public DecodedItem firstItem; public DecodedItem lastItem; } } } In my C# code I just use Log.PageManager.Page but I cannot figure out how to create a Page object in Python. (I need to pass a Page object as an argument to a method.) Is this possible ? Thanks Morné Joubert --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.

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How to create an instance of C# from pythonnet?
by Seungweon Park April 19, 2013

April 19, 2013

Hi, I have Adapter.dll with namespace 'AAA.BBB.Adapter" written in C# which gives network adapter information. I want to call one of method GetSpeed(). I don't know How to create an instance in python. Would you give me some clue for writing the same python code like below powershell script using python.net I don't see any sample code which python creates C# class instance. Python --------------------------- C:\CVS\Pythonnet>npython Python 2.7.3 (default, Apr 10 2012, 23:31:26) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import os,sys >>> sys.path.append("c:\\cvs\\powershelliteexample\\networktestlibrary\\iteextensions") >>> sys.path ['', 'C:\\Python27\\lib\\site-packages\\paramiko-1.10.0-py2.7.egg', 'C:\\CVS\\Python\\libs', 'C:\\Windows\\system32\\pyt hon27.zip', 'C:\\Python27\\Lib', 'C:\\Python27\\DLLs', 'C:\\Python27\\Lib\\lib-tk', 'C:\\CVS\\Pythonnet', 'C:\\Python27' , 'C:\\Python27\\lib\\site-packages', 'C:\\Windows\\Microsoft.NET\\Framework\\v4.0.30319\\', 'c:\\cvs\\powershelliteexam ple\\networktestlibrary\\iteextensions'] >>> import clr >>> clr.FindAssembly("Adapter") u'c:\\cvs\\powershelliteexample\\networktestlibrary\\iteextensions\\Adapter.dll' >>> clr.AddReference("Adapter") <System.Reflection.RuntimeAssembly object at 0x052028A0> I don't know how to create an instance of Adapter. Thank you, Spark. Powershell ---------------------------- PS C:\CVS\PowershellITEExample> Import-Module .\LoadAdapter.psd1 PS C:\CVS\PowershellITEExample> $adapter = New-object -type "AAA.BBB.Adapter" PS C:\CVS\PowershellITEExample> $ret = $adapter.GetAdapter("TestAdapter", "oids.xml") PS C:\CVS\PowershellITEExample> $ret.Passed True PS C:\CVS\PowershellITEExample> $baseAdapter = $ret.FunctionReturnValue PS C:\CVS\PowershellITEExample> $baseAdapter.GetSpeed() Passed : True Failed : False Errored : False Status : Pass Description : Speed retrieved successfully. FunctionReturnValue : auto

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Release Memory
by Trudel, Stephen April 17, 2013

April 17, 2013

I have a simply Python script that creates a big DataTable, sets the reference None, and the does a GC. I cannot seem to reclaim managed memory. Any advice would be appreciated ---------------------------------------------------------------------- This message, and any attachments, is for the intended recipient(s) only, may contain information that is privileged, confidential and/or proprietary and subject to important terms and conditions available at http://www.bankofamerica.com/emaildisclaimer. If you are not the intended recipient, please delete this message.

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How to compile Python for .Net in VS2010 and .NET 4?
by Seungweon Park April 8, 2013

April 8, 2013

Hello, I downloaded from SVN, and tried to compile it in VS2010 with Windows 2008 R2. However, it requires Mono.Unix reference in error message. so I installed mono(mono-2.10.9-gtksharp-2.12.11-win32-0.exe from http://www.go-mono.com/mono-downloads/download.html. And added Mono.Posix.dll as reference, and compiled again, got error. FYI, I selected build option as DebugWin/x86. ------------------------------------------------------------------------------ The command "call "buildclrmodule.bat" x86 "c:\cvs\pythonnet\src\runtime\" "c:\cvs\pythonnet\src\runtime\bin\x86\release\clr.pyd" copy "c:\cvs\pythonnet\src\runtime\bin\x86\Release\Python.Runtime.dll" "c:\cvs\pythonnet\" copy "c:\cvs\pythonnet\src\runtime\bin\x86\Release\*.pdb" "c:\cvs\pythonnet" copy "c:\cvs\pythonnet\src\runtime\bin\x86\Release\clr.pyd" "c:\cvs\pythonnet" " exited with code 1." ------------------------------------------------------------------------------ Any idea? Thanks, spark. [image: Inline image 1]

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