Stop tmux detached session closing when command finishes

Question

When I fire up a new, detached tmux session using something like

tmux new-session -d -s "newname" 'python my file.py'

the tmux session seems to disappear from tmux ls once my python program has finished. I'd like to drop back into a shell. How do I do that?

Answer 1

Use send-keys to run your script in the default shell process in the new window.

tmux new-session -d -s "new name"
tmux send-keys -t "new name:0" "python my file.py" Enter