Mailman 3 November 2012 - 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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Setting PYTHONPATH from code
by Sharon Rozenblum April 5, 2013

April 5, 2013

Hi! Can someone tell me how to set PYTHONPATH variable in code when working with Python.Runtime.dll without changing the value in the system variables before. Thanks SHARON ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies).

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Problem install PythonNet 2 in ubuntu10.04 with python 2.6 and mono 2.10
by Antonio Palomo Nov. 13, 2012

Nov. 13, 2012

hi !! I want to use Python.NET, but i´m doing something wrong because when i import clr in python i get the next error *** glibc detected *** python: free(): invalid pointer: 0xb619c100 *** i have done the steps are as follows: + install mono 2.10 + install libmono-2.0.so.1 + download pythonnet-2.0-alpha2-136-py26.zip I have unzipped it and i have tried execute setup.py with python, but this give me this error : Perhaps you should add the directory containing `mono-2.pc' to the PKG_CONFIG_PATH environment variable) but i haven´t got this file. So i have copied the files in /pythonnet-2.0-alpha2-136-py26/python2.6-UCS2 to my folder where i have python packages /usr/local/lib/python2.7/dist-packages/ and after i have tried import clr in shell of python ,at this point I've gotten the bug I mentioned at the beginning . if anyone can help me telling me how to solve some of the problems would be very grateful :) thanks!!! Antonio

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strange behavior when adding
by John Burkhart Nov. 9, 2012

Nov. 9, 2012

Hello, I'm working with a custom built set of .NET 4 assemblies. The .NET assemblies have a type 'TimeSeries'. These time series can have operations conducted on them (addition, averaging, etc.), which returns a new type ('BinaryOperation'). I can do this in IronPython no problem: >>> >>> type(tsvalues) <type 'List[ITimeSeries]'> >>> type(tsvalues[0]) <type 'TimeSeries'> >>> sumts = tsvalues[0] + tsvalues[1] >>> type(sumts) <type 'BinaryOperation'> >>> However, in pythonnet the BinaryOperation fails... conducting the identical steps in pythonnet I get the following: >>> type(tsvalues) System.Collections.Generic.0, Culture=neutral, PublicKeyToken=null]] >>> type(tsvalues[0]) TimeSeries >>> sumts = tsvalues[0]+tsvalues[1] --------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-79-367816bc7679> in <module>() ----> 1 sumts = tsvalues[0]+tsvalues[1] TypeError: unsupported operand type(s) for +: 'TimeSeries' and 'TimeSeries' Any ideas on why pythonnet and IronPython would handle operations on my class types differently? In pythonnet do my types have to have the .__add__, .__sub__, etc. method-wrappers implemented?? Thank you, john

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Re: [Python.NET] Getting started with Python for .NET
by Liam Corrigan Nov. 7, 2012

Nov. 7, 2012

You do not need to add the extension in the AddReference call. Just clr.AddReference("DotNet4Class") From DotNet4Class import * ---------------------------------------------------------------------- Message: 1 Date: Tue, 6 Nov 2012 19:08:59 +0000 (UTC) From: Anneka Boccio <adp(a)cypress.com> To: pythondotnet(a)python.org Subject: [Python.NET] Getting started with Python for .NET Message-ID: <loom.20121106T200549-162(a)post.gmane.org> Content-Type: text/plain; charset=us-ascii I'm completely new to Python for .Net, and I actually have very little experience with Python and no experience with C#. So please forgive me if my question seems very basic. I'm using Python 2.7.3, and I downloaded pythonnet-2.0-alpha2-clr2.0_131_py27_UCS2 and unzipped it into a folder named pyfornet_test, which also contains the dll I'm trying to use (called DotNet4Class.dll) Then I run this: import sys import os import clr sys.path.append(r"C:\pyfornet_test") clr.AddReference("DotNet4Class.dll") Which gives me this error: System.IO.FileNotFoundException: Unable to find assembly 'DotNet4Class.dll'. at Python.Runtime.CLRModule.AddReference(String name) in C:\Users\Barton\Documents\Visual Studio 2008\Projects\PyShar p\trunk\pythonnet\src\runtime\moduleobject.cs:line 375 Any advice would be much appreciated. Thank you! ------------------------------ Subject: Digest Footer _______________________________________________ PythonDotNet mailing list PythonDotNet(a)python.org http://mail.python.org/mailman/listinfo/pythondotnet ------------------------------ End of PythonDotNet Digest, Vol 103, Issue 7 ******************************************** This message is intended only for the use of the named addressee. It may contain information that is copywritten, privileged, confidential and exempt from disclosure under applicable law. If you are not the intended recipient, you are notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this in error, please notify the sender immediately and delete it from your system. Communications using this system are monitored and recorded for lawful business purposes.

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Re: [Python.NET] Getting started with Python for .NET
by John Burkhart Nov. 7, 2012

Nov. 7, 2012

Annika, I too just started with pythonnet. What I'm learning is that the compilation of pythonnet needs to match that of the .dll you are trying to load. So, for instance, how was your .dll built (for .NET 4? 3.5? ..). Check that. In my case I had to build pythonnet targeted for .NET 4 but it caused many other problems with underlying imports of pure CPython. I made a recent post on the issue for IPython: http://wiki.ipython.org/Cookbook/python.NET Maybe that will help!

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Getting started with Python for .NET
by Anneka Boccio Nov. 6, 2012

Nov. 6, 2012

I'm completely new to Python for .Net, and I actually have very little experience with Python and no experience with C#. So please forgive me if my question seems very basic. I'm using Python 2.7.3, and I downloaded pythonnet-2.0-alpha2-clr2.0_131_py27_UCS2 and unzipped it into a folder named pyfornet_test, which also contains the dll I'm trying to use (called DotNet4Class.dll) Then I run this: import sys import os import clr sys.path.append(r"C:\pyfornet_test") clr.AddReference("DotNet4Class.dll") Which gives me this error: System.IO.FileNotFoundException: Unable to find assembly 'DotNet4Class.dll'. at Python.Runtime.CLRModule.AddReference(String name) in C:\Users\Barton\Documents\Visual Studio 2008\Projects\PyShar p\trunk\pythonnet\src\runtime\moduleobject.cs:line 375 Any advice would be much appreciated. Thank you!

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apologies for poor posting
by John Burkhart Nov. 5, 2012

Nov. 5, 2012

Just a quick apology for posting poorly. I am trying a new workflow to manage lists in gmail, and I didn't quite get it right just yet...

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Re: [Python.NET] PythonDotNet Digest, Vol 103, Issue 4
by John Burkhart Nov. 5, 2012

Nov. 5, 2012

Thanks all for the replies! I've also been in touch with the folks at Enthought, and they provided the idea that has led to me posting a question at StackExchange: http://stackoverflow.com/questions/13222393/compiling-pythonnet-net-to-work… I'm pretty sure my bit-to-bit issue is accounted for. I've also used the numpy from EPD in the same python I'm using for pythonnet and that has no problems. As far as the UCS issues, I was only able to build the pythonnet project as UCS-2, if I changed that string to UCS-4 the build crashed... maybe something on windows? Thanks for helping! On Sat, Nov 3, 2012 at 12:00 PM, <pythondotnet-request(a)python.org> wrote: > Send PythonDotNet mailing list submissions to > pythondotnet(a)python.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://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. Re: pythonnet and numpy (Stephen P. Lepisto) > 2. Re: pythonnet and numpy (Bradley Friedman) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Fri, 02 Nov 2012 19:48:39 -0700 > From: "Stephen P. Lepisto" <stephenp(a)otakuworld.com> > To: pythondotnet(a)python.org > Subject: Re: [Python.NET] pythonnet and numpy > Message-ID: <50948607.3070802(a)otakuworld.com> > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" > > Make sure you are installing the correct "bitness" of numpy for your > install of python (64-bit to 64-bit, 32-bit to 32-bit). > > On 11/2/2012 8:42 AM, Bradley Friedman wrote: > > That error suggests issues with your path or current directory. > > Multiple or incompatible dynamic libraries etc. in the path. > > Generally speaking, pythonnet does work with numpy. Something > > specific is wrong, loading a dll in a low level manner that msvc is > > upset. > > > > Sent from my iPad > > > > On Nov 2, 2012, at 10:55 AM, John Burkhart <jfburkhart.reg(a)gmail.com > > <mailto:jfburkhart.reg@gmail.com>> wrote: > > > >> Hello, > >> > >> As mentioned in the other thread, I have built pythonnet with VS2012 > >> for a 64-bit Python installation and using .NET 4 assemblies. Things > >> seem to work well. > >> > >> However, I just tried to `import numpy` and all hell broke loose... > >> the reason I pursued pythonnet was because I thought it would allow > >> me to use the pure CPython modules without needing to rely on any of > >> the modified versions built for IronPython. Below is the PowerShell > >> output from starting EPD and importing numpy and starting pythonnet > >> python.exe and importing numpy. > >> > >> PS G:\svn\Python\pythonnet\trunk\pythonnet\src\console\bin\Debug> > >> python #should load EPD python > >> Enthought Python Distribution -- www.enthought.com > >> <http://www.enthought.com> > >> Version: 7.3-2 (64-bit) > >> > >> Python 2.7.3 |EPD 7.3-2 (64-bit)| (default, Apr 12 2012, 15:20:16) > >> [MSC v.1500 64 bit (AMD64)] on win32 > >> Type "credits", "demo" or "enthought" for more information. > >> >>> import numpy; print numpy.__version__ > >> 1.6.1 > >> >>> exit() > >> PS G:\svn\Python\pythonnet\trunk\pythonnet\src\console\bin\Debug> > >> .\python.exe > >> Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit > >> (AMD64)] on win32 > >> Type "help", "copyright", "credits" or "license" for more information. > >> >>> import numpy > >> [Bang!] - A window opens with > >> TITLE: Microsoft Visual C++ Runtime Library > >> Message: Runtime Error! > >> > >> Program: G:\svn\Python... > >> > >> R6034 > >> An application has made an attempt to load the C runtime library > >> incorrectly > >> Please contact the application's support team for more information > >> """ > >> > >> This is not a lot of information, but maybe someone has some ideas on > >> how to troubleshoot? > >> > >> Thank you, > >> john > >> > >> > >> > >> > >> > >> _________________________________________________ > >> Python.NET <http://Python.NET> mailing list - PythonDotNet(a)python.org > >> <mailto:PythonDotNet@python.org> > >> http://mail.python.org/mailman/listinfo/pythondotnet > > > > > > _________________________________________________ > > Python.NET mailing list - PythonDotNet(a)python.org > > http://mail.python.org/mailman/listinfo/pythondotnet > > -- > Stephen P. Lepisto > >

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assemblymanager and reflection only assemblies
by brad＠fie.us Nov. 4, 2012

Nov. 4, 2012

fyi: I ran into a bug and fixed it… I think? Some thoughts on what I did? I am writing an application that loads plugins. As part of that, it first loads the plugin assembly in "reflection only" mode. pythonnet's assemblymanager.cs registers a handler at line 54. it gets called when I load the assembly… even in reflection mode. Which I think is correct. the handler begins at line 88. it was throwing an exception when it tries to "ScanAssembly()" on the passed assembly. More specifically when it tried to load the types. If I'm reading the code right, it should not attempt to scan the assembly because it is loaded reflection only. One can check this with the "ReflectionOnly" property of the provided assembly. So I surrounded the rest of the code in a "if" conditional and only add the assembly and scan it, if it is not "RefelctionOnly." Is that the right thing to do? It's gotten rid of my problem. But I wonder if its strictly correct to both not add it to the assemblies collection in the manager and also not scan it. Thoughts? I don't want to submit a patch if it's not really the right approach to the matter.

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