Please I need a a guide on how I can upload to a SFTP server.

Please I need a a guide on how I can upload to a SFTP server.
I have almost complete the development: the user management and the upload, but where am having issues here is instead of uploading to a folder in the application directory I want to be uploading it on a server.
 
I have done the user management, I can upload to a folder in the directory (configured in the settings.py). What I want to do is instead of uploading the files to a folder in the directory, I want to upload it to an sFTP (or just FTP) server (remote).

I hope this is clear enough.

Thanks.