python 网络编程

python 网络

客户端：
import socket
s=socket.socket()
host = socket.gethostname()
port = 1234
s.connect((host, port))
print s.recv(1024)

服务端：
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 you for connecting')
c.close()

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

加上正规表达式
import re
text = webpage.read()
m = re.search('<a href="([^"]+)" .*?>about</a>', text, re.IGNORECASE)
m.group(1)

urllib
urllib2

一个基于SocketServer的小型服务器例子：
from SocketServer import TCPServer, StreamRequestHandler
>>> class Handler(StreamRequestHandler):
def handle(self):
addr = self.request.getpeername()
print 'Got connection from', addr
self.wfile.write('Thank you for connecting')

>>> server = TCPServer(('',1234), Handler)
>>> server.serve_forever()

使用SocketServer进行分叉和线程处理
分叉Server:
from SocketServer import TCPServer,ForkingMinIn, StreamRequestHandler
class Server(ForkingMinIn, TCPServer):pass
class Handler(StreamRequestHandler):
def handle(self):
addr = self.request.getpeername()
print 'Got connection from',addr
self.wfile.write('Thank you for connection')
server = Server(('',1234),Handler)
server.serve_forever()

线程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 you for connecting')
server = Server(('',1234),Handler)
server.serve_forever()

带有select和pool的异步I/O
select服务：
import socket, select
s = socket.socket()
host = socket.gethostname()
prot = 1234
s.bind((host,port))

s.listen(5)
inputs = [s]
while True:
rs,ws,es = select.select(inputs,[],[])
for r in rs:
if r is 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服务器：
import socket, select
s = socket.socket()
host = socket.gethostname()
port = 1234
s.bind((host, port))

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', addr
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网络框架