python-TCP模拟ftp文件传输

  #!/usr/bin/python
 #coding=utf-8
 #server
 from socket import*
 import sys,os
 def command():
     l=[ "Welcome!\n","command\n", "list\n","upload\n","download\n"]
     return l
 def list():
     l=[]
     for filename in os.listdir('.'):
         l.append(filename)
     return l
 HOST="192.168.1.33"
 PORT=5126
 ADDR=(HOST,PORT)
 sockob=socket(AF_INET,SOCK_STREAM)
 sockob.bind(ADDR)
 sockob.listen(5)

 a=[]
 while 1:
     sock,addr=sockob.accept()

     while 1:
         data=sock.recv(1024)
         str=data.split(" ")

         if data =="command":
             a=command()
             for i in a:
                 sock.send(i)
         elif data =="list":
             a=list()
             for i in a:
                 sock.send(i)
         elif str[0]=="upload":
             f=open(str[1],'w')
             s=sock.recv(1024)
             print s
             for i in s: #range(len(str)):
                 f.write(i)
             print "upload is ok!"
         elif str[0]=="download":
             f=open(str[1],'r')
             s=f.readlines()
             for i in s:
                 sock.send(i)
             print "download is ok!"
 sockob.close()
 sock.close()

 #!/usr/bin/python
 #coding=utf-8
 #client
 from socket import *
 import sys

 HOST='192.168.1.33'
 PORT=5126
 ADDR=(HOST,PORT)
 sockob=socket(AF_INET,SOCK_STREAM)
 sockob.connect(ADDR)

 while 1:
     data=raw_input(">",)
     str=data.split(' ')
     if not str:
         break
     elif str[0]=="upload":
         f=open(str[1],'r')
         sockob.send(data)
         s0=f.readlines()
         print s0
         for i in s0:
             sockob.send(i)
     elif str[0]=="download":
         f=open(str[1],'w')
         sockob.send(data)
         s1=sockob.recv(1024)
         f.write(s1)
     elif data=="command" or data=="list":
         sockob.send(data)
         data=sockob.recv(1024)
         print data

 sockob.close()