Question

I’m using python 3.3.this is Server.py.Everything is fine both server and client are able to connect
something might be wrong in here ‘tcpcli.send(‘[%s]%s’%(bytes(ctime(),’utf-8′),data))’.help me out

from socket import *
from time import ctime

HOST=''
PORT=21567
BUFSIZ=1024
ADDR=(HOST,PORT)

tcp=socket(AF_INET,SOCK_STREAM)
tcp.bind(ADDR)
tcp.listen(5)

while True:
    print('waiting for connection')
    tcpcli,addr=tcp.accept()
    print('...connected from:',addr)

    while True:
        data=tcpcli.recv(BUFSIZ)
        if not data:
            break
        tcpcli.send('[%s]%s'%(bytes(ctime(),'utf-8'),data))
    tcpcli.close()
tcp.close()                 

This is CLient.py

    from socket import *


HOST='127.0.0.1'
PORT=21567
BUFSIZ=1024
ADDR=(HOST,PORT)

tcpcli=socket(AF_INET,SOCK_STREAM)
tcpcli.connect(ADDR)


while True:
    data=input('>')
    if not data:
        break
    tcpcli.send(data)
    data=tcpcli.recv(BUFSIZ)
    if not data:
        break
    print (data.decode('utf-8'))

tcpcli.close()                 

When i’m running both they are working fine except I’m unable to send any data from client.
I’m getting this error message.

tcpcli.send(data)
TypeError: 'str' does not support the buffer interface

Answer 1

You are building unicode strings, not byte strings, and the socket interface doesn’t support unicode strings. You’ll need to encode the result of the string interpolation:

    tcpcli.send(bytes('[%s]%s' % (ctime(),data), 'utf-8'))