.env no longer contributes to Python environment

[timthedevguy]

Type: Bug

Behaviour

Prior to release on 2025/02/11 I could enable the optInto feature named "pythonTerminalEnvVarActivation" and would have any environment variable that is supplied by a local .env file accessible in the terminal to be used by the running python app.

Steps to reproduce:

1. Create a Python project and .venv, activate the venv as normal
2. Create a file named .env in the project and add enviornment variables
3. Add "python.experiments.OptInto": ["pythonTerminalEnvVarActivation"]" to settings
4. Open new terminal within VSCode
5. View environment contributions via link in Terminal popup, or import os, os.environ['VAR_NAME'] in interactive python session

Diagnostic data

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

2025-02-11 12:31:50.853 [info] Experiment 'pythonTerminalEnvVarActivation' is active
2025-02-11 12:31:50.853 [info] Experiment 'pythonTestAdapter' is active
2025-02-11 12:31:50.853 [info] Experiment 'pythonRecommendTensorboardExt' is active
2025-02-11 12:31:51.077 [info] > pyenv which python
2025-02-11 12:31:51.077 [info] cwd: .
2025-02-11 12:31:54.001 [info] Discover tests for workspace name: sire - uri: c:\Users\redacted\Projects\Python\sire
2025-02-11 12:31:55.590 [info] Starting Pylance language server.
2025-02-11 12:32:09.933 [info] Discover tests for workspace name: sire - uri: c:\Users\redacted\Projects\Python\sire
2025-02-11 12:33:33.601 [info] Discover tests for workspace name: undefined - uri: c:\Users\redacted\AppData\Roaming\Code\User\profiles\-598afd23\settings.json
2025-02-11 12:36:33.943 [info] Discover tests for workspace name: undefined - uri: c:\Users\redacted\AppData\Roaming\Code\User\profiles\-598afd23\settings.json

Extension version: 2025.0.0
VS Code version: Code 1.97.0 (33fc5a94a3f99ebe7087e8fe79fbe1d37a251016, 2025-02-04T22:41:26.688Z)
OS version: Windows_NT x64 10.0.26100
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.11.9
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): System
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

experiments
• optInto: ["pythonTerminalEnvVarActivation","pythonTestAdapter"]

Installed Extensions

Extension Name	Extension Id	Version
alpinejs	pic	1.0.0
autodocstring	njp	0.6.1
autopep8	ms-	2024.2.0
debugpy	ms-	2025.0.0
django	big	1.0.2
django-html	bib	1.3.0
django-intellisense	sha	0.0.2
djlint	mon	2024.10.0
dotenv	mik	1.0.1
flake8	ms-	2024.0.0
format-selection-stub	mot	0.0.2
gitlens	eam	16.2.2
html-css-class-completion	Zig	1.20.0
htmx-v2-tags	dan	0.0.8
iis-express	war	1.5.0
isort	ms-	2023.10.1
js-debug	ms-	1.97.0
js-debug-companion	ms-	1.1.3
libman	adr	1.0.1
markdown-all-in-one	yzh	3.6.2
npm	ide	1.7.4
open-in-browser	tec	2.0.0
powershell	ms-	2025.0.0
prettier-vscode	esb	11.0.0
pylint	ms-	2024.2.0
python	ms-	2025.0.0
rainbow-csv	mec	3.17.0
rainbow-tags	vol	0.4.1
read-urls	mur	2.1.0
redis-for-vscode	Red	1.2.0
remote-wsl	ms-	0.88.5
test-adapter-converter	ms-	0.2.1
todo-tree	Gru	0.0.226
volar	Vue	2.2.0
vsc-python-indent	Kev	1.19.0
vscode-azurefunctions	ms-	1.16.2
vscode-azureresourcegroups	ms-	0.10.4
vscode-django	bat	1.15.0
vscode-docker	ms-	1.29.4
vscode-edit-csv	jan	0.11.2
vscode-fontawesome-gallery	tom	0.0.7
vscode-gitflow	Ser	1.3.27
vscode-github-actions	git	0.27.1
vscode-html-css	ecm	2.0.13
vscode-icons	vsc	12.11.0
vscode-js-profile-table	ms-	1.0.10
vscode-markdownlint	Dav	0.58.2
vscode-mdx-preview	xyc	0.3.3
vscode-pylance	ms-	2025.2.1
vscode-python-envs	ms-	0.3.10421010
vscode-python-test-adapter	lit	0.8.2
vscode-test-explorer	hbe	2.22.1
vscode-thunder-client	ran	2.34.0
vscode-yarn	gam	2.1.0

System Info

Item	Value
CPUs	12th Gen Intel(R) Core(TM) i5-12600KF (16 x 3686)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.84GB (14.30GB free)
Process Argv	--folder-uri file:///c%3A/Users/redacted/Projects/Python/evetools --crash-reporter-id 55e8d7b9-404f-4260-840a-36bf2b8177f5
Screen Reader	no
VM	0%

[timthedevguy]

Reverting to 2024.22.2 restores functionality

[karthiknadig]

@timthedevguy This happens if you have ms-python.vscode-python-envs installed. This feature is still being implemented there, moving this to envs repo.