import paramiko, socks

# PySocks recommends using no arguments,
# because it only supports the defaults anyway.
sock = socks.socksocket()

host, port = '127.0.0.1', 1234

# Set up your proxy information for this socket
sock.set_proxy(
    proxy_type=socks.SOCKS5,
    addr=host,
    port=port,
    username='spam',
    password='eggs',
)

# Connect the socket
sock.connect((host, port))

# Create your Paramiko Transport
transport = paramiko.Transport(sock)
transport.connect(
    username='rabbit',
    password='grenade',
)
client = paramiko.SFTPClient.from_transport(transport)

# Do stuff

# Clean up
client.close()
transport.close()