This is related to #134466, but is regarding the basic REPL.

If you remove the ability to write ioctls to tty stdio, for example on macOS by doing

PYTHON_BASIC_REPL=1 sandbox-exec -p '(version 1) (import "system.sb") (allow process-exec) (allow file-read* (subpath "/"))' python3.13

then the REPL never shows the prompt and doesn't allow interaction, but hangs forever.

Linked PRs

• gh-139027: readline doesn't degrade gracefully when tcsetattr() fails. #139989