client2.py

#!/usr/bin/env python3
# encoding: utf-8
# @author: hoojo
# @email: hoojo_@126.com
# @github: https://github.com/hooj0
# @create date: 2018-04-10 23:03:37
# @copyright by hoojo@2018
# @changelog Added python3 `socket -> client2` example


# Echo client program
import socket
import sys

HOST = 'localhost'    # The remote host
PORT = 50007              # The same port as used by the server
s = None
for res in socket.getaddrinfo(HOST, PORT, socket.AF_UNSPEC, socket.SOCK_STREAM):
    print('res', res)
    
    af, socktype, proto, canonname, sa = res
    
    print('AddressFamily:', af)
    print('sockType:', socktype)
    print('proto:', proto)
    print('canonname', canonname)
    print('host/port:', sa)
    
    try:
        s = socket.socket(af, socktype, proto)
    except socket.error as msg:
        s = None
        continue
    
    try:
        s.connect(sa)
    except socket.error as msg:
        s.close()
        s = None
        continue
    break

if s is None:
    print('could not open socket')
    sys.exit(1)
    
s.send(b'Hello, world')
data = s.recv(1024)
s.close()

print('Received', repr(data))