简单的FTP下载 ，不加任何异常判断。

import os

from ftplib import FTP

ftp_addr = '10.10.0.1'

f=FTP(ftp_addr)

f.login('anonymous')

f.cwd("apk_download/")

remote_file = '20141223140651.apk'

f.retrbinary("RETR %s" % remote_file, open(remote_file, "wb").write)

网上搜到个带 异常处理的版本来自

http://www.hiadmin.org/code/python-ftp

#! encoding:utf-8

# Filename : ftptestdown.py

#使用ftplib.error_perm函数来打印输出错误信息

import ftplib

import os

import socket

remote_host = "ftp.kernel.org"

remote_dir = "/pub/linux/kernel/v1.0"

remote_file = "patch8.gz"

def kernelmain():

try:

ftp = ftplib.FTP(remote_host)

except (socket.error, socket.gaierror):

print "ERROR cannot reach '%s'" % remote_host

return

print "..Connected to remote_host '%s'.." %remote_host

try:

ftp.login() #使用匿名账号登陆也就是anonymous

except ftplib.error_perm:

print "ERROR cannot login anonymously"

ftp.quit()

return

print "...logged in as 'anonymously'..."

try:

ftp.cwd(remote_dir) #切换当前工作目录

except ftplib.error_perm:

print "ERROR cannot cd to '%s'" % remote_dir

ftp.quit()

return

print "....Changed to '%s' folder...." % remote_dir

try:#传一个回调函数给retrbinary() 它在每接收一个二进制数据时都会被调用

ftp.retrbinary("RETR %s" % remote_file, open(remote_file, "wb").write)

except ftplib.error_perm:

print "ERROR cannot remote_file '%s'" % remote_file

os.unlink(remote_file)

else:

print ".....Download '%s' to cwd....." % remote_file

ftp.quit()

return

#调用函数执行测试

if __name__ == "__main__":

kernelmain()