如何使用python对XML进行签名（suds）

我一直在尝试对一个由suds创建的XML对象进行签名，但没有成功

我当前的脚本如下所示

from suds.client import Client
from suds.transport.http import HttpAuthenticated
from suds.transport import Reply, TransportError

import requests

class RequestsTransport(HttpAuthenticated):

    def __init__(self, **kwargs):
        self.cert = kwargs.pop('cert', None)
        HttpAuthenticated.__init__(self, **kwargs)

    def send(self, request):
        self.addcredentials(request)
        resp = requests.post(
            request.url,
            data=request.message,
            headers=request.headers,
            cert=self.cert,
            verify=True
        )
        result = Reply(resp.status_code, resp.headers, resp.content)
        return result

url = 'URL'
headers = {"Content-Type": "text/xml;charset=UTF-8",
           "SOAPAction": ""}
t = RequestsTransport(cert=("path to cert","path to key"))
client = Client(url, headers=headers, transport=t)

我创建了一个方法，然后我需要对它进行签名。我有一个pem文件，用于我正在检查的WSDL的公共证书

此外，如果我没有签署请求，我会得到：

suds.WebFault:Server引发的错误：“在处理标题时发现了一个错误”

我发现python wsse（）可以很好地处理suds

    from suds.client import Client
    from suds.wsse import Security, Timestamp
    from wsse.suds import WssePlugin

    def get_client(our_keyfile_path, our_certfile_path, their_certfile_path):
        wsse = Security()
        wsse.tokens.append(Timestamp())

        return Client(
            wsdl_url,
            transport=transport,
            wsse=wsse,
            plugins=[
                WssePlugin(
                    keyfile=our_keyfile_path,
                    certfile=our_certfile_path,
                    their_certfile=their_certfile_path,
                ),
            ],
        )

---

transport

来自哪里？