http://codegouge.blogspot.com/2013/04/using-python-and-paramiko-to-move-bits.html

gistfile1.py

import os, paramiko

USERNAME = "username"
PASSWORD = "password"

trans = paramiko.Transport(("remotehost", 22))
trans.connect(username=USERNAME, password=PASSWORD)
sftp = paramiko.SFTPClient.from_transport(transport)

local_dir = "/path/to/local/files"
remote_dir = "/path/to/remote/destination"

for dirname,subdirs,files in os.walk(local_dir):
    for fname in files:
        full_path = os.path.join(dirname, fname)
        remote_path = remote_dir + full_path[len(local_dir):]
        sftp.put(full_path, remote_path)

sftp.close()
transport.close()