Environment variables are not synchronized #2539

gitlsl · 2025-01-04T13:29:57Z

gitlsl
Jan 4, 2025

Environment

Pythonnet version:3.0.5
Python version:3.12
Operating System:win11
.NET Runtime:.net8

Details

Describe what you were trying to get done.

I tested the virtual environment created with Poetry and it always failed. The test found that there were issues with the environment variables

Environment.SetEnvironmentVariable("AA","BB");

Runtime.PythonDLL = @"D:\Program Files\Python312\python312.dll";
PythonEngine.Initialize();

PythonEngine.RunSimpleString("""

                             import os
                             
                             for e in os.environ:
                                 print(e,':', os.environ[e])
                             """);

no AA in os.environ， so Environment variables in https://github.com/pythonnet/pythonnet/wiki/Using-Python.NET-with-Virtual-Environments no effect, So it leads to the inability to call Python in virtual environments？

iFreilicht · 2025-11-27T10:40:59Z

iFreilicht
Nov 27, 2025

I'm also experiencing this, but even environment variables set outside of the runtime seem to have no effect. I also tried setting them with dotnet test -e AA=BB, but even those don't show up in os.environ. Even the explicitly read VIRTUAL_ENV has no effect, which makes me wonder whether this is an issue with .NET itself. I'm using 8.0

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Environment variables are not synchronized #2539

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Environment variables are not synchronized #2539

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gitlsl Jan 4, 2025

Environment

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Replies: 1 comment

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iFreilicht Nov 27, 2025

gitlsl
Jan 4, 2025

iFreilicht
Nov 27, 2025