Unable to start up Python interpreter on .ipynb

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

When trying to run some code in .ipynb the IDE is consistently asking me to select a Python interpreter, I select my interpreter and it does nothing. If I switch back to .py files my interpreter indicates its been selected on the bottom right hand corner. I check if i had the correct packages installed:

jupyter 1.1.1
jupyter_client 8.6.3
jupyter-console 6.6.3
jupyter_core 5.7.2
jupyter-events 0.12.0
jupyter-lsp 2.2.5
jupyter_server 2.15.0
jupyter_server_terminals 0.5.3
jupyterlab 4.3.4
jupyterlab_pygments 0.3.0
jupyterlab_server 2.27.3
jupyterlab_widgets 3.0.13
ipykernel 6.29.5

All seems to be fine, i tried this on 2 different machines using 2 different environments last night and go the same results.

Steps to Reproduce

Create an env in anaconda
Create .ipynb file
Write any code
Run code
You will be prompted to select a python interpreter
Select interpreter you created in conda
Nothing will happen, if you try to run the code again your be prompted again

Expected Behavior

Once interpreter selected I should be able to run the code using that environment

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 2.0.64 (user setup)
VSCode Version: 1.99.3
Commit: 25412918da7e74b2686b25d62da1f01cfcd27680
Date: 2025-11-06T04:35:14.424Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Windows_NT x64 10.0.26100

For AI issues: which model did you use?

nan

For AI issues: add Request ID with privacy disabled

nan

Does this stop you from using Cursor

No - Cursor works, but with this issue

1 Like
3

Hey, thanks for the report. This looks like an issue with the Python/Jupyter extensions. To diagnose, please share:

Extension versions (Extensions panel):

  • Python by Anysphere (anysphere.cursorpyright)
  • Python (ms-python.python)
  • Jupyter (ms-toolsai.jupyter)
  • Python Debugger (ms-python.debugpy)

Console logs:

  • Help > Toggle Developer Tools > Console - share errors when you try to select the interpreter

Extension test:

  • Run without extensions: cursor --disable-extensions
  • Check if the issue persists

Screenshot:

  • Show what happens when you select the conda interpreter

Also try:

  • Reinstall the Python and Jupyter extensions
  • Create a simple .py file in the same folder, select your conda interpreter there (Ctrl+Shift+P > “Python: Select Interpreter”), then reopen the .ipynb
  • Check if the conda environment appears in the interpreter list

Let me know what you find!

4

I haven’t worked with Jupiter, but if this happens in the (Agent) console, then check if venv is activated. Cursor after version 1.5-1.6 does not know how to activate venv automatically in the Agent’s console and there may also be problems in the usual.

6

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