print client.last_received().getChild("soap:Envelope").getChild("soap:Header")
.getChild("ResponseHeader").getChild("resultCode").getText()

from suds.plugin import MessagePlugin

class HeaderPlugin(MessagePlugin):
    def __init__(self):
        self.document = None

    def parsed(self, context):
        self.document = context.reply

    def get_headers(self, method):
        method = method.method
        binding = method.binding.output
        rtypes = binding.headpart_types(method, False)

        envns = ('SOAP-ENV', 'http://schemas.xmlsoap.org/soap/envelope/')
        soapenv = self.document.getChild('Envelope', envns)
        soapheaders = soapenv.getChild('Header', envns)
        nodes = soapheaders.children
        if len(nodes):
            resolved = rtypes[0].resolve(nobuiltin=True)
            return binding.unmarshaller().process(nodes[0], resolved)
        return None

from suds.client import Client

hp = HeaderPlugin()
client = Client(wsdl, plugins=[hp])

response = client.service.LoremIpsum()
headers = hp.get_headers(client.service.LoremIpsum)

>>> headers
(AuthenticationResponseHeader){
   sessionKey = "a631cd00-c6be-416f-9bd3-dbcd322e0848"
   validUntil = 2030-01-01 01:01:01.123456+01:00
 }
>>> headers.validUntil
datetime.datetime(2030, 1, 1, 1, 1, 1, 123456, tzinfo=<suds.sax.date.FixedOffsetTimezone object at 0x7f7347856be0>)

class HeaderPlugin(MessagePlugin):
    def __init__(self):
        self.document = None

    def parsed(self, context):
        self.document = context.reply

    def get_headers(self, method):
        Result = {}  #Soap Header list
        method = method.method
        binding = method.binding.output
        SHeaderElem = binding.headpart_types(method, False)

        envns = ('SOAP-ENV', 'http://schemas.xmlsoap.org/soap/envelope/')
        soapenv = self.document.getChild('Envelope', envns)
        soapheaders = soapenv.getChild('Header', envns)
        SHeaderNodes = soapheaders.children

        for Elem in SHeaderElem:
            for Node in SHeaderNodes:
                if(Node.name == Elem.name):
                    ElemRes = Elem.resolve(nobuiltin=True)
                    NodeRes = binding.unmarshaller().process(Node, ElemRes)
                    Result[Elem.name] = NodeRes
        return Result
    #

<soap-env:Envelope xmlns:eb="http://www.ebxml.org/namespaces/messageHeader" xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/"  xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/12/secext">
    <soap-env:Header>
        <eb:MessageHeader eb:version="1.0" soap-env:mustUnderstand="1">
            <!-- -->
        </eb:MessageHeader>
        <wsse:Security>
            <!-- -->
        </wsse:Security>
    </soap-env:Header>
    <soap-env:Body>
        <!-- -->
    </soap-env:Body>
</soap-env:Envelope>

SoapHeadersResp = {'MessageHeader':MessageHeader, 'Security':SecurityObj}