import os
import paramiko

config_file = os.path.join(os.getenv('HOME'), '.ssh/config')
ssh_config = paramiko.SSHConfig()
ssh_config.parse(open(config_file, 'r'))
lkup = ssh_config.lookup('dev-env')

ssh = paramiko.SSHClient()
ssh.load_system_host_keys()
ssh.connect(
    lkup['hostname'],
    username=lkup['user'],
    key_filename=lkup['identityfile'],
    sock=paramiko.ProxyCommand(lkup['proxycommand'])
)

sftp = ssh.open_sftp()
print(sftp.listdir('/var/log'))
sftp.close()
ssh.close()