Python Network programming common code Snippets _python

Server-side code:

#-*-coding:cp936-*-
import socket 
sock = Socket.socket (socket.af_inet, socket. SOCK_STREAM) #初始化socket 
sock.bind (("127.0.0.1", 8001)) #绑定本机地址, 8001 Port
sock.listen (5) #等待客户连接 while 
True :
  print "Waiting Client connection ..."
  connection,address = sock.accept () #接收客户连接请求
  print "A client have Connected ... "While
  True:
    try: 
      connection.settimeout (5) #设置超时时间
      buf = CONNECTION.RECV (1024) # Receive Data
      if buf = = "1": 
        connection.send ("You have send me 1!welcome to server!")
      Elif buf== "2":
        connection.send ("You have send me 2! I have recv! ")
      Elif buf== "3":
        connection.send ("Close the connection!")
        Break
      Else: 
        connection.send ("Unknow command!") 
    Except Socket.timeout: 
      print "Time Out" 
  connection.close ()
  print "A client exit ..."

Client Side code:

Import socket 
sock = Socket.socket (socket.af_inet, socket. SOCK_STREAM) 
Sock.connect (("127.0.0.1", 8001)) 
import Time 
time.sleep (2) while
True:
  data=raw _input ("Input command:");
  Sock.send (data)
  print SOCK.RECV (1024)
  if data== "3":
    break
Sock.close ()

1. First open two idle, the server-side and client-side code are opened separately.
2.f5 running server-side code, there will be waiting client connection ...
3.f5 running client code, the input command appears:;
4. At this time the server and the client connected, you can normal communication, as shown:

5. Run the server-side code again, there will be errors, then you can through the Task Manager, the Pythonw.exe process will be completed, reopened, compile on it!

Client:

Import Socket
S=socket.socket ()
host = Socket.gethostname ()
port = 1234
S.connect (host, Port)
Print S.RECV (1024)

Service side:

Import socket
s = socket.socket ()
host = Socket.gethostname ()
port = 1234
S.bind (host, Port
 
) S.listen (5)
while True:
 c, addr = S.accept ()
 print "Got connection from", Addr
 c.send (' Thank for Conn Ecting ')
 c.close ()

HTTP programming

From urllib import urlopen
webpage = urlopen (' http://www.python.org ')

Plus regular Expressions

import re
text = Webpage.read ()
m = Re.search (' <a href= "([^"]+) ".*?>about</a>", text, re. IGNORECASE)
M.group (1)

Urllib
Urllib2

An example of a small server based on Socketserver:

From Socketserver import tcpserver, Streamrequesthandler
>>> class Handler (Streamrequesthandler):
	def handle (self):
		addr = Self.request.getpeername ()
		print ' Got connection from ', addr self.wfile.write
		(' Thank for connecting ')
 
>>> server = TCPServer ((', 1234), Handler)
>>> server.serve_ Forever ()

Fork and thread handling using Socketserver
Fork Server:

From Socketserver import Tcpserver,forkingminin, Streamrequesthandler
class Server (Forkingminin, tcpserver):p
class Handler (Streamrequesthandler):
 def handle (self):
  addr = Self.request.getpeername ()
  print ' Got connection from ', addr
  self.wfile.write (' Thank for Connection ')
Server = Server ((', 1234), Handler)
Server.serve_forever ()

Thread Server:

From Socketserver import TCPServer, ThreadingMixIn, Streamrequesthandler
class Server (ThreadingMixIn, TCPServer): Pass
class Handler (Streamrequesthandler):
 def handle (self):
  addr = Self.request.getpeername ()
  print ' Got connection from ', addr
  self.wfile.write (' Thank for connecting ')
Server = Server ((', 1234), Handler)
Server.serve_forever ()

asynchronous I/O with select and pool
Select service:

Import socket, select
s = Socket.socket ()
host = Socket.gethostname ()
prot = 1234
s.bind ((host,port)) C5/>s.listen (5)
inputs = [s] while
True:
 rs,ws,es = Select.select (inputs,[],[]) for
 R in RS:
  if R are s:
  c, addr = S.accept ()
  print ' Got connection from ', addr
  inputs.append (c)
 else:
  try:
   data = R.RECV (1024)
   disconnected = not data
  except Socket.error:
   disconnected = True
   
  If Disconnected:
   print r.getpeername (), ' Disconnected '
   inputs.remove (R)
  else:
   print data

Pool server:

Import socket, select
s = Socket.socket ()
host = Socket.gethostname ()
port = 1234
S.bind (host, Port) C5/>fdmap = {S.fileno (): s}
 
S.listen (5)
P = select.poll ()
P.register (s) while
True:
 events = P.poll ()
 for FD, event in events:
  if FD in Fdmap:
   c, addr = S.accept ()
   print ' Got connection from ', ad Dr
   P.register (c)
   Fdmap[c.fileno ()]=c
  elif event & Select. Pollin:
   data = FDMAP[FD].RECV (1024)
   if not data:
    print fdmap[fd].getpeername (), ' Disconnected '
    P.unregister (FD)
    del fdmap[fd]
  else:
   print data

Twisted Network Framework

Http://www.jb51.net/article/64199.htm