import socket

# create an INET, STREAM socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.connect(('localhost', 8000))
s.connect(('127.0.0.1', 8000))
s.connect(('www.baidu.com', 80))

def mysend(s, msg):
  total_len = len(msg)
  total_sent = 0
  while total_sent < total_len:
    sent = s.send(msg[total_sent:])
    if sent == 0:
      raise RuntimeError("socket connection broken")
    total_sent += sent

import socket
s = socket.socket()
s.connect(('www.baidu.com', 80))
s.sendall('test')

# Python 2.7
>>> import socket
>>> s = socket.socket()
>>> s.connect(('www.baidu.com', 80))
>>> s.sendall('test')

# Python 3.4
>>> import socket
>>> s = socket.socket()
>>> s.connect(('www.baidu.com', 80))
>>> s.sendall('test')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: 'str' does not support the buffer interface

data = s.recv(4096)

def myreceive(s, msglen):
  chunks = []
  bytes_recd = 0
  while bytes_recd < msglen:
    chunk = s.recv(min(msglen - bytes_recd, 2048))
    if chunk == b'':
      raise RuntimeError("socket connection broken")
    chunks.append(chunk)
    bytes_recd = bytes_recd + len(chunk)
  return b''.join(chunks)

import socket

HOST = ''
PORT = 10022

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((HOST, PORT))
s.listen(10)
conn, addr = s.accept()
while True:
  data = conn.recv(1024)
  if not data:
    break
  conn.sendall(data)
conn.close()

import socket

HOST = 'localhost'
PORT = 10022

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
s.sendall(b'hello socket')
data = s.recv(1024)
print('Received', repr(data))
s.close()

import socket

HOST = None
PORT = 10022

try:
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  s.bind((HOST, PORT))
  s.listen(10)
except: socket.error as msg:
  print(msg)