Allow custom Transport

[eyesee1]

Hi, if you make this simple change, then people can easily use a custom transport:

class Client(object):
    """
    Connection to a WordPress XML-RPC API endpoint.

    To execute XML-RPC methods, pass an instance of an
    `XmlrpcMethod`-derived class to `Client`'s `call` method.
    """

    def __init__(self, url, username, password, blog_id=0, transport=None):
        self.url = url
        self.username = username
        self.password = password
        self.blog_id = blog_id
        self.transport = transport

        try:
            if self.transport:
                self.server = xmlrpc_client.\
                    ServerProxy(url, allow_none=True,
                                transport=self.transport)
            else:
                self.server = xmlrpc_client.ServerProxy(url, allow_none=True)
            self.supported_methods = self.server.mt.supportedMethods()
        except xmlrpc_client.ProtocolError:
            e = sys.exc_info()[1]
            raise ServerConnectionError(repr(e))

    def call(self, method):
        if method.method_name not in self.supported_methods:
            raise UnsupportedXmlrpcMethodError(method.method_name)

        server_method = getattr(self.server, method.method_name)
        args = method.get_args(self)

        try:
            raw_result = server_method(*args)
        except xmlrpc_client.Fault:
            e = sys.exc_info()[1]
            if e.faultCode == 403:
                raise InvalidCredentialsError(e.faultString)
            elif e.faultCode == 405:
                raise XmlrpcDisabledError(e.faultString)
            else:
                raise
        return method.process_result(raw_result)

[eyesee1]

The reason this is useful: when you have to work with a wordpress installation you don't control, and it's returning XML with extra spaces, you can make a Transport that will strip them off, and then everything else can continue to function. And apparently it's quite easy to inadvertently introduce whitespace that will cause Expat parsing errors.

[eyesee1]

Also, you might want to use a transport that supports gzip.