教你怎么使用XML库实现RPC通信的功能

import operator, mathfrom SimpleXMLRPCServer import SimpleXMLRPCServerfrom functools import reducedef main():    server = SimpleXMLRPCServer(('127.0.0.1', 7001))    server.register_introspection_functions()    server.register_multicall_functions()    server.register_function(addtogether)    server.register_function(quadratic)    server.register_function(remote_repr)        print("Server ready")    server.serve_forever()    def addtogether(*things):    """Add together everything in the list things ."""    return reduce(operator.add, things)    def quadratic(a, b, c):    """Determine x values satisfying: a * x * x + b * x + c = 0"""    b24ac = math.sqrt(b*b - 4.0*a*c)    return list(set([(-b-b24ac) / 2.0*a, (-b+b24ac) / 2.0*a]))    def remote_repr(arg):    """return the repr() rendering of the supplied arg """    return arg    if __name__ == '__main__':    main()

import xmlrpclibdef main():    proxy = xmlrpclib.ServerProxy('http://127.0.0.1:7001')        print("Here are the functions supported by this server:")        print("next calculator addtogether: ")    print(proxy.addtogether('x','y','z'))    print(proxy.addtogether('x','y','z'))        print(proxy.addtogether('x','y','z'))    print(proxy.addtogether('x','y','z'))    for method_name in proxy.system.listMethods():        if method_name.startswith('system.'):            continue                    signatures = proxy.system.methodSignature(method_name)        if isinstance(signatures, list) and signatures:            for signature in signatures:                print('%s(%s)' %(method_name, signature))                        else:            print('%s(...)' %(method_name,))                    method_help = proxy.system.methodHelp(method_name)        #if method_help:        #    print(' ', methodHelp)        print(proxy.addtogether('x','y','z'))    print("addtogether result ")            if __name__ == '__main__':    main()