一、远程过程调用rpc
xml-rpc is a remote procedure call method that uses xml passed via http as a transport. with it, a client can call methods with parameters on a remote server (the server is named by a uri) and get back structured data. this module supports writing xml-rpc client code; it handles all the details of translating between conformable python objects and xml on the wire.
简单地，client可以调用server上提供的方法，然后得到执行的结果。类似与webservice。
推荐查看xmlprc的源文件：c:\python31\lib\xmlrpc
二、实例
1） server
代码如下:
from xmlrpc.server import simplexmlrpcserver
from xmlrpc.server import simplexmlrpcrequesthandler
def div(x,y):
    return x - y
class math:
    def _listmethods(self):
        # this method must be present for system.listmethods
        # to work
        return ['add', 'pow']
    def _methodhelp(self, method):
        # this method must be present for system.methodhelp
        # to work
        if method == 'add':
            return add(2,3) => 5
        elif method == 'pow':
            return pow(x, y[, z]) => number
        else:
            # by convention, return empty
            # string if no help is available
            return
    def _dispatch(self, method, params):
        if method == 'pow':
            return pow(*params)
        elif method == 'add':
            return params[0] + params[1]
        else:
            raise 'bad method'
server = simplexmlrpcserver((localhost, 8000))
server.register_introspection_functions()
server.register_function(div,div)
server.register_function(lambda x,y: x*y, 'multiply')
server.register_instance(math())
server.serve_forever()
2）client
代码如下:
import xmlrpc.client
s = xmlrpc.client.serverproxy('http://localhost:8000')
print(s.system.listmethods())
print(s.pow(2,3))  # returns 28
print(s.add(2,3))  # returns 5
print(s.div(3,2))  # returns 1
print(s.multiply(4,5)) # returns 20
3）result