/usr/lib/python2.7/dist-packages/Crypto/Cipher/blockalgo.py:141:
FutureWarning: CTR mode needs counter parameter, not IV   self._cipher = factory.new(key, *args, **kwargs)

t = paramiko.Transport((host, port))
key = paramiko.RSAKey.from_private_key_file("/path/to/key.ssh")
t.connect(username="username",password=None, pkey=key)

sftp = paramiko.SFTPClient.from_transport(t)
sftp.put(source, destination)

sftp.close()
t.close()