import base64
import paramiko
#key = paramiko.RSAKey(data=base64.b64decode(b'nicekeyherefrommy.rsafolder'))
client = paramiko.SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.WarningPolicy())

#client.get_host_keys().add('druidia.com', 'ecdsa-sha2-nistp256', key)#'ssh-rsa', key)
client.connect('druidia.com', username='pres_skroob', password='12345')
stdin, stdout, stderr = client.exec_command('ls')
for line in stdout:
    print('... ' + line.strip('n'))
client.close()

import base64
import paramiko
import os

# get host key, if we know one
hostkeytype = None
hostkey = None
hostname = "druidiia.com"
Port=22
username = "pres_skroob"
password = "12345"
try:
    host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
except IOError:
    try:
        # try ~/ssh/ too, because windows can't have a folder named ~/.ssh/
        host_keys = paramiko.util.load_host_keys(os.path.expanduser('~/ssh/known_hosts'))
    except IOError:
        print('*** Unable to open host keys file')
        host_keys = {}

print host_keys

if hostname in host_keys:
    hostkeytype = host_keys[hostname].keys()[0]
    hostkey = host_keys[hostname][hostkeytype]
    print('Using host key of type %s' % hostkeytype)


# now, connect and use paramiko Transport to negotiate SSH2 across the connection
try:
    t = paramiko.Transport((hostname, Port))
    #t.connect(hostkey, username, password, gss_host=self.hostname,gss_auth=UseGSSAPI, gss_kex=DoGSSAPIKeyExchange)
    t.connect(hostkey, username, password)
    sftp = paramiko.SFTPClient.from_transport(t)
 ...
...
...
except Exception as e:
    print('*** Caught exception: %s: %s' % (e.__class__, e))
    traceback.print_exc()
    try:
        t.close()
    except:
        pass
    sys.exit(1)

<paramiko.hostkeys.HostKeys object at 0x21fefd0>
Using host key of type ecdsa-sha2-nistp256
*** Caught exception: <class 'paramiko.ssh_exception.AuthenticationException'>: Authentication failed.
Traceback (most recent call last):
  File "sftptest2.py", line 68, in <module>
    traceback.print_exc()
NameError: name 'traceback' is not defined