I'm new to python and going through a book, Core Python Applications 3rd Edition. This is the the first example and already I'm stumped with it. Here's the code with the error at the end.
#!/usr/bin/env python 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("[%s] %s" % (ctime(), data)) tcpCliSock.close() tcpSerSock.close() Traceback (most recent call last): File "tsTserv.py", line 12, in <module> tcpSerSock.bind(ADDR) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 224, in meth socket.gaierror: [Errno 8] nodename nor servname provided, or not known
What does this mean?
It means that your given host name ' '
is invalid (gai stands for getaddrinfo()
).
As NPE already states, maybe an empty string ''
would be more appropriate than a space ' '
.
The
HOST = ' '
should read
HOST = ''
(i.e. no space between the quotes).
The reason you're getting the error is that ' '
is not a valid hostname. In this context, ''
has a special meaning (it basically means "all local addresses").
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