I'm kind of confused, I have set up public keys between two servers and it works great, sort of. It only works if I ssh manually from a terminal. When I put the ssh command into a python script, it asks me for a password to login. The script is using rsync to sync up a directory from one server to the other.

manual ssh command that works, no password prompt, automatic login:

 ssh -p 1234 [email protected]

In the Python script:

rsync --ignore-existing --delete --stats --progress -rp -e "ssh -p 1234" [email protected]:/directory/ /other/directory/

What gives?

(obviously, ssh details are fake)