[Tutor] a problem with a server and client

[Evert Rol]

> i'm trying to implement a server that adds a time stamp to incoming text form a client.
> 
> the server's code is (but doesn't seem to have the problem as demoed by the error below:
> 
> from socket import *
> from time import ctime
> 
> HOST = ''
> PORT = 21567
> BUFSIZ = 1024
> ADDR =(HOST, PORT)
> 
> tcpSerSock = socket(AF_INET, SOCK_STREAM)
> 
> tcpSerSock.bind(ADDR)
> tcpSerSock.listen(5)
> 
> while True:
>     print('waiting for connection ...')
>     tcpCliSock, addr =tcpSerSock.accept()
>     print('...connected from: ', addr)
> 
>     while True:
>         data = tcpCliSock.recv(BUFSIZ)
>         if not data:
>             break
>         tcpCliSock.send('[{}] {}'.format(bytes(ctime(), 'utf-8'),data))
> 
>     tcpCliSock.close()
> tcpSerSock.close()
> 
> 
> 
> the client's code is:
> 
> from socket import *
> 
> 
> HOST = 'localhost'
> PORT = 21567
> BUFSIZ = 1024
> ADDR =(HOST, PORT)
> 
> tcpCliSock = socket(AF_INET, SOCK_STREAM)
> 
> tcpCliSock.bind(ADDR)
> 
> while True:
>     data=input('> ')
>     if not data:
>         break
>     tcpCliSock.send(data)
>     data = tcpCliSock.recv(BUFSIZ)
>     if not data:
>         break
>     print(data.decode('utf-8'))
> 
> tcpCliSock.close()
> 
> the problem is i get the following error when i enter some text:
> 
> Traceback (most recent call last):
>   File "C:\Python32\tsTclnt3.py", line 17, in <module>
>     tcpCliSock.send(data)
> TypeError: 'str' does not support the buffer interface

Did you try to search on the error string? That would have gotten you the solution (even) faster.
The first two Google hits (and probably all the rest of them), tell me that Python 3's socket.send() method wants bytes as input, not str. See http://docs.python.org/py3k/library/socket.html#socket.socket.send

Hope that helps,

  Evert


> 
> can you help?
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