I've been having this same issue recently and it's driving me mad.

macOS Sequoia Version 15.1 python 3.9.6 64bit vscode insiders 1.96.0-insider (Universal)

Extensions: Python (microsoft) - rolled back to 2024.14.0 Pylance Python debugger github copilot github copilot chat

Read countless threads trying to find others with the same issue, trying all recommended solutions but no luck.

• increasing buffer settings
• different installations of vscode / clean re-installs
• rolled back python extension
• reinstalled all extensions
• changed / removed overlapping keyboard shortcuts
• tried running selection in virtual environments
• tried installing most recent python version as different interpreter

Your issue sounds identical to mine, running any more than a few selected lines of code at a time results in the output to terminal freezing up while executing the code, only running a few lines before getting stuck/frozen halfway through running a random line (depending on where I start the selection from).

It seems as though the code WILL run if I go line by line but in a file with 100+ lines this is not ideal.

This functionality was working fine before and something has broken it but I cannot for the life of me figure out what.

The only other major change to my computer recently was upgrading the OS to Sequoia, so i will likely try that next but was avoiding having to revert OS.

example of code stopping halfway through line selection