Mailman 3 June 2021 - 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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Support for Python v3.9
by Douglas Wyant (Aptly Technology Corporation) July 22, 2021

July 22, 2021

PythonNet, Hi folks, I have no idea if this is the correct way to engage support / ask questions, so please redirect me. We need to deploy Python v3.9 to resolve a known Security issue in older versions. I'm told we're blocked on deploying until PythonNet is updated to support v3.9. So the question is when might that be? https://bugs.python.org/issue41944 CVE-2020-27619: WIndows Python versions 3.0.0 through 3.9.0 are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). Affected Versions Python versions 3.0.0 through 3.9.0 Thanks, Doug Wyant (Aptly Technology Corporation), GSEC, GCIH Service Engineer 2 Microsoft

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PythonNet installed manually on windows enterprise
by jupal1998＠gmail.com June 28, 2021

June 28, 2021

Dear PythonNet Team, I am an empolyee at a company using windows entersprise 1909, and We are currently working on a python project for to help automate some things that needs a few .NET functions to be able to push items into an SQL database. That is why we are chose pythonnet. My problem is the following: I think The IDEEs (VS code and Pycharm) We are using cannot „see” the imported pythonnet libraries. I think the installation of the pythonnet module is the main source of this inconvinience. We cannot install python modules automatically with pip because of the company firewall proxy settings, we have to use a manual method: downloading the pythonnet.whl, and install it with the following command in cmd.exe: pip install python_module.whl -f ./ --no-index --no-deps. For example we import clr module and use the following lines: clr.AddReference('System') clr.AddReference('System.Data') from System.Data.SqlClient import * But the enviroment shows error on this: Unresolved reference System, and i cannot run the program. I tried to use a different method by using cmd.exe to run it, but the result is the same. How can i import System module manually with .whl, or .gz? I could not find it on pypi website. I hope You can help us! I see forward to Your answer! Yours sincerely, Pál Juhász

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Working group notes for June 17, 2021
by Mark Visser June 21, 2021

June 21, 2021

Attendees: Amos, Mark, Felix, Victor Agenda: Review last week's action items: Victor to make a list of breaking changes in his branch that could land for 3.0 and discuss with Benedikt Felix to review #1426 <https://github.com/pythonnet/pythonnet/pull/1426> & #1441 <https://github.com/pythonnet/pythonnet/pull/1441> Victor to update https://github.com/pythonnet/pythonnet/pull/1133 <https://github.com/pythonnet/pythonnet/pull/1133> and check with Benedikt that it's still good to land for 3.0 Amos concerned about performance Notes #1426 <https://github.com/pythonnet/pythonnet/pull/1426> & #1441 <https://github.com/pythonnet/pythonnet/pull/1441> merged possibility of performance improvements in bindings https://github.com/topameng/tolua <https://github.com/topameng/tolua> bindings perform much better than Python for .NET Victor: please add any missing coverage to performance tests so we can catch regressions Amos: there is room for improvement in Python .NET performance code gen to improve performance? will likely introduce breaking changes I have a branch already that improves performance Victor: if it's not risky and can be ported to current master it could go into 3.0 (no sooner than September) Victor: make a PR against master branch and describe the breaking changes import refactor almost done, waiting for Benedikt to review Action Items: Victor to make a list of breaking changes in his branch that could land for 3.0 and discuss with Benedikt Victor to update https://github.com/pythonnet/pythonnet/pull/1133 <https://github.com/pythonnet/pythonnet/pull/1133> and check with Benedikt that it's still good to land for 3.0 Amos to create a PR to master with bindings performance improvements Benedikt to review https://github.com/pythonnet/pythonnet/pull/1369 Modernize import hook <https://github.com/pythonnet/pythonnet/pull/1369> The meeting notes google doc is here <https://docs.google.com/document/d/1rJVU84B_dgx58-_EopjRtOJVFAI2WfHJYV0n7uE…>. Feel free to correct or add additional information. The next meeting will be held on Thursday, July 8 at 2pm EST (click for your time zone) <https://www.google.com/search?q=2%3A00+pm+EST>. Mark Visser Senior Dev Manager, M&E Unity Technologies - www.unity3d.com <http://www.unity3d.com/>

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Mapped DataTypes of Python to .NET
by Satya Prasad June 9, 2021

June 9, 2021

I have a 32 bit .NET DLL - so I made use of PythonNet Module <http://pythonnet.github.io/> and msl.loadlib.server32 module <https://msl-loadlib.readthedocs.io/en/latest/_api/msl.loadlib.server32.html> as I am using Python 64 bit version. I am a just a beginner in this domain - and below is my query. Thru ILSpy I can see the below signature: [DllImport("DISCOM.DLL", CharSet = CharSet.Unicode)] public static extern uint CancelRequests(IntPtr data); I tried opening DISCOM.DLL via ILSpy and Pythonnet but could not do so - how can we call the above API and create a Python datatype of IntPtr. Please let me know how to Convert Python data types to .NET format and vice versa Regards, Prakash

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