import paramiko
import os

hostname="alias.im"
port=22
username="guillaume"
paramiko.util.log_to_file('sftp.log')

t = paramiko.Transport((hostname, port))
keys = paramiko.Agent().get_keys()
rsakeys = [key for key in keys if key.name=="ssh-rsa"]
gkey = rsakeys[0]
host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
hostkey = host_keys[hostname]['ssh-rsa']
t.connect(username="guillaume", hostkey=hostkey, pkey=gkey)
sftp = paramiko.SFTPClient.from_transport(t)
dirlist = sftp.listdir('.')
print("Dirlist:", dirlist)
t.close()