Client server implementation

[Babloo]

Hi everyone,

                  i wanted to implement a client- server connection
and transfer a file over the network. i was able to implement a normal
set up where in i was able to send chat messages and small chunks of
data.
I want to implement the file transfer with out using the FTP library
available in python .

                  So can anyone suggest a piece of code by which i can
do that.

Thanks
Pruthvi