sftp = pysftp.Connection(host='Host',username='username',password='passwd',private_key=".ppk")

cnopts = pysftp.CnOpts()
cnopts.hostkeys = None
s = pysftp.Connection(host='host', username='user', password='password', cnopts=cnopts)

client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect("host",username = "username",password = "password")
ssh_session = client.get_transport().open_session()

cnopts = pysftp.CnOpts()
cnopts.hostkeys = None
sftp = pysftp.Connection(
    host='Host', username='username', password='passwd', private_key=".ppk", cnopts=cnopts)