[Twisted-Python] Need help using FTPClient

Hi. I am new to Twisted. I am using this code: http://twistedmatrix.com/documents/current/core/examples/ftpclient.py<http://twistedmatrix.com/documents/current/core/examples/ftpclient.py> Can this example be used to connect to an FTP through a SOCKS4/5 proxy? Can somebody provide an example of how it should be done? Thanks