# -*- coding: utf-8 -*-

import ftplib

def ftpcp(source, sourcename, target, targetname='', type='I'):

"""Copy file from one FTP-instance to another."""

if not targetname:

targetname = sourcename

type = 'TYPE ' + type

source.voidcmd(type)

target.voidcmd(type)

sourcehost, sourceport = ftplib.parse227(source.sendcmd('PASV'))

target.sendport(sourcehost, sourceport)

# RFC 959: the user must "listen" [...] BEFORE sending the

# transfer request.

# So: STOR before RETR, because here the target is a "user".

treply = target.sendcmd('STOR ' + targetname)

if treply[:3] not in {'125', '150'}:

raise ftplib.error_proto # RFC 959

sreply = source.sendcmd('RETR ' + sourcename)

if sreply[:3] not in {'125', '150'}:

raise ftplib.error_proto # RFC 959

source.voidresp()

target.voidresp()