python.execSelectionInTerminal not working in 2025.20.1

[jennadiegel-cdio]

Type: Bug

Behaviour

shift + enter command used for python.execSelectionInTerminal will open a python terminal, but not send the code
No error is printed out, nothing happens except opening the python terminal.

Used "Developer: Toggle Keyboard Shortcuts Troubleshooting" to confirm that
the command "python.execSelectionInTerminal" was being triggered to confirm it is not an issue with an overlapping keyboard shortcut. Output: 2025-12-22 09:43:15.057 [info] [Window] [KeybindingService]: + Invoking command python.execSelectionInTerminal.

I was able to get the functionality of shift+enter running the command back after switching to 2025.20.0

Steps to reproduce:

1. Have python extension version 2025.20.1 installed
2. Hit shift + enter on a line of code

Diagnostic data

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

XXX

Extension version: 2025.20.0
VS Code version: Code 1.107.1 (Universal) (994fd12f8d3a5aa16f17d42c041e5809167e845a, 2025-12-17T14:15:14.850Z)
OS version: Darwin arm64 24.6.0
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.12.3
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Venv
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

Installed Extensions

Extension Name	Extension Id	Version
black-formatter	ms-	2025.2.0
debugpy	ms-	2025.18.0
js-debug	ms-	1.105.0
js-debug-companion	ms-	1.1.3
jupyter	ms-	2025.9.1
jupyter-keymap	ms-	1.1.2
jupyter-renderers	ms-	1.3.0
pdf	tom	1.2.2
prettier-vscode	esb	11.0.2
python	ms-	2025.20.0
r	REd	2.8.6
r-syntax	REd	0.1.3
rainbow-csv	mec	3.23.0
remote-containers	ms-	0.434.0
remote-explorer	ms-	0.5.0
remote-server	ms-	1.5.3
remote-ssh	ms-	0.122.0
remote-ssh-edit	ms-	0.87.0
remote-wsl	ms-	0.104.3
svg-preview	Sim	2.8.3
vscode-js-profile-table	ms-	1.0.10
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
vscode-pylance	ms-	2025.10.4
vscode-remote-extensionpack	ms-	0.26.0

[anthonykim1]

@jennadiegel-cdio Could you provide a gif? Thanks

[jennadiegel-cdio]

@anthonykim1

This file (v2025.20.0) is the expected behavior, shift + enter opens a python terminal and runs the line of code
https://github.com/user-attachments/assets/35cba2b8-3b39-4ac8-90c5-2cc363010070

This file (v2025.20.1) is what is happening with the most recent version. Shift + enter opens a python terminal, does not run the line of code
https://github.com/user-attachments/assets/c47234e3-2494-4867-a2d2-f4284df4a63a

[anthonykim1]

@jennadiegel-cdio Could you update VS Code to the latest insiders and try again? Insiders build

Also what do you see when hovering over terminal tab? Is it rich shell integration or something else

[anthonykim1]

Also see if there is any difference when you enable or disable environment extension:

Try install https://marketplace.visualstudio.com/items?itemName=ms-python.vscode-python-envs

Can you update Python extension, Python environment extension to latest and see if you can still repro?
Also add "python.useEnvironmentsExtension": true, to your settings.json.

Try also false to see if any of those make a difference.