python-zeep fails to build with Python 3.10.0b1.

=================================== FAILURES ===================================
_____________________ test_mime_content_serialize_text_xml _____________________

    def test_mime_content_serialize_text_xml():
        wsdl_content = StringIO(
            """
        <definitions xmlns="http://schemas.xmlsoap.org/wsdl/"
                     xmlns:tns="http://tests.python-zeep.org/tns"
                     xmlns:http="http://schemas.xmlsoap.org/wsdl/http/"
                     xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/"
                     xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
                     xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                     targetNamespace="http://tests.python-zeep.org/tns">
    
          <message name="Input">
            <part name="arg1" type="xsd:string"/>
            <part name="arg2" type="xsd:string"/>
          </message>
          <message name="Output">
            <part name="Body" type="xsd:string"/>
          </message>
    
          <portType name="TestPortType">
            <operation name="TestOperation">
              <input message="Input"/>
              <output message="Output"/>
            </operation>
          </portType>
    
          <binding name="TestBinding" type="tns:TestPortType">
            <http:binding verb="POST"/>
            <operation name="TestOperation">
              <http:operation location="test-operation"/>
              <input>
                <mime:content type="text/xml"/>
              </input>
              <output>
                <mime:mimeXml part="Body"/>
              </output>
            </operation>
          </binding>
        </definitions>
        """.strip()
        )
    
        root = wsdl.Document(wsdl_content, None)
    
        binding = root.bindings["{http://tests.python-zeep.org/tns}TestBinding"]
        operation = binding.get("TestOperation")
    
        assert (
            operation.input.body.signature(schema=root.types)
            == "TestOperation(arg1: xsd:string, arg2: xsd:string)"
        )
        assert (
            operation.input.signature(as_output=False)
            == "arg1: xsd:string, arg2: xsd:string"
        )
    
        assert (
            operation.output.body.signature(schema=root.types)
            == "TestOperation(Body: xsd:string)"
        )
        assert operation.output.signature(as_output=True) == "xsd:string"
    
        serialized = operation.input.serialize(arg1="ah1", arg2="ah2")
        assert serialized.headers == {"Content-Type": "text/xml"}
        assert serialized.path == "test-operation"
        assert_nodes_equal(
>           load_xml(serialized.content),
            load_xml("<TestOperation><arg1>ah1</arg1><arg2>ah2</arg2></TestOperation>"),
        )

tests/test_wsdl_messages_http.py:286: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
tests/utils.py:8: in load_xml
    return etree.fromstring(xml.strip(), parser=parser)
src/lxml/etree.pyx:3237: in lxml.etree.fromstring
    ???
src/lxml/parser.pxi:1896: in lxml.etree._parseMemoryDocument
    ???
src/lxml/parser.pxi:1784: in lxml.etree._parseDoc
    ???
src/lxml/parser.pxi:1141: in lxml.etree._BaseParser._parseDoc
    ???
src/lxml/parser.pxi:615: in lxml.etree._ParserContext._handleParseResultDoc
    ???
src/lxml/parser.pxi:725: in lxml.etree._handleParseResult
    ???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

>   ???
E     File "<string>", line 2
E   lxml.etree.XMLSyntaxError: Extra content at the end of the document, line 2, column 64


For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.10/fedora-rawhide-x86_64/02197949-python-zeep/

For all our attempts to build python-zeep with Python 3.10, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/package/python-zeep/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.10:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.10.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.