Mailman 3 October 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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subclassing managed types in python
by Tony Roberts Oct. 17, 2013

Oct. 17, 2013

Hi, am I right in thinking that currently when managed types are subclassed in python the python methods can't override the base class methods when called from .net? It would be useful to be able to do this for something I'm working on at the moment, and before I started looking at it I wondered if anyone has done any work on this before? I think it should be possible to achieve by creating new managed types using System.Reflection.Emit.TypeBuilder and replace any virtual methods with ones that first look for a method on the python object with the same name before falling back to the base class method - the same way SWIG wrappers work for C++ classes basically but done dynamically. In the case where there are multiple methods with the same name but different signatures the python method would override them all and have to check what it had been passed to do the right thing. Any thoughts? thanks, Tony

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trapping errors
by Jason Sachs Oct. 15, 2013

Oct. 15, 2013

Is there a way to trap errors in python.net? I have an instance of try: doSomethingInDotNetThatMayFail() except: logger.exception("Something really wrong happened") and when the .NET library I'm using fails, it prints out an error message but never gets to the except: clause, and Python crashes.

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