You don't need an FTP client. Python provides one!

ftp_upload.py

#!/usr/bin/env python
# encoding: utf-8

import ftplib
import sys

ftp_server = sys.argv[1]
ftp_port = sys.argv[2]
filename = sys.argv[3]

session = ftplib.FTP()
session.connect(ftp_server, ftp_port)
session.login()
with open(filename, 'rb') as fd:
    session.storbinary('STOR ' + filename, fd)
session.quit()