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我正在尝试使用 Zeep 在序列中进行选择，但我无法完成这项工作。

这是我的代码：

#create trade ref element
tradeReference_element = client.get_element('ns4:tradeReference')
trade_ref_object = xsd.AnyObject(tradeReference_element, tradeReference_element(tradeId="NKY 12/08/17 C21000"))

#create export element
export_element = client.get_element('ns32:export')
export_element_object = xsd.AnyObject(export_element, export_element(_value_1={'tradeReference' : trade_ref_object}))

#use exportEntities service
client.service.exportEntities(export=export_element_object)

我收到以下错误：

client.service.exportEntities(export=export_element_object)
Traceback (most recent call last):

  File "<ipython-input-14-3cee211bc26a>", line 1, in <module>
    client.service.exportEntities(export=export_element_object)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\client.py", line 41, in __call__
    self._op_name, args, kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\wsdl\bindings\soap.py", line 110, in send
    options=options)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\wsdl\bindings\soap.py", line 68, in _create
    serialized = operation_obj.create(*args, **kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\wsdl\definitions.py", line 197, in create
    return self.input.serialize(*args, **kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\wsdl\messages\soap.py", line 63, in serialize
    body_value = self.body(*args, **kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\elements\element.py", line 48, in __call__
    instance = self.type(*args, **kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\types\complex.py", line 42, in __call__
    return self._value_class(*args, **kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\valueobjects.py", line 89, in __init__
    items = _process_signature(self._xsd_type, args, kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\valueobjects.py", line 199, in _process_signature
    values = element.parse_kwargs(kwargs, None, available_kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\elements\indicators.py", line 204, in parse_kwargs
    sub_result = element.parse_kwargs(kwargs, elm_name, available_kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\elements\element.py", line 118, in parse_kwargs
    kwargs, name or self.attr_name, available_kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\types\complex.py", line 278, in parse_kwargs
    value = self._create_object(value, name)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\types\complex.py", line 303, in _create_object
    return self(value)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\types\complex.py", line 42, in __call__
    return self._value_class(*args, **kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\valueobjects.py", line 89, in __init__
    items = _process_signature(self._xsd_type, args, kwargs)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\valueobjects.py", line 176, in _process_signature
    values, args, index = element.parse_args(args, index)

  File "C:\ProgramData\Anaconda2\lib\site-packages\zeep\xsd\elements\indicators.py", line 130, in parse_args
    raise TypeError("Choice elements only work with keyword arguments")

TypeError: Choice elements only work with keyword arguments

因此，问题似乎是“选择元素仅适用于关键字参数”

我的导出 element_object 如下：

<AnyObject(type=<Element(name=u'export', type=<zeep.xsd.dynamic_types.ExportMessage object at 0x0D966490>)>, value={
    'header': None,
    'validation': [],
    '_value_1': [
        {
            'tradeReference': <AnyObject(type=<Element(name=u'tradeReference', type=<zeep.xsd.dynamic_types.TradeReference object at 0x0D394C30>)>, value={
                'tradeId': {
                    '_value_1': 'NKY 12/08/17 C21000',
                    'tradeIdScheme': None
                },
                'href': None,
                'ID': None
            }
        }
    ],
    'version': None,
    'batchType': 'NoSession',
    'followDependencies': 'false',
    'exportReferencesOnly': 'false'
})>

我认为问题是“_value_1”，但它是由 Zeep 创建的，并且存在关键字“tradeReference”。

谁能指出我做错了什么？

导出元素：

<xsd:complexType name="ExportMessage">
  <xsd:complexContent>
    <xsd:extension base="fpml:Message">
      <xsd:sequence>
        <xsd:choice minOccurs="0" maxOccurs="unbounded">
          <xsd:element ref="party:partyReference">...</xsd:element>
          <xsd:element ref="trade:tradeReference">...</xsd:element>
          <xsd:element ref="valuation:market">...</xsd:element>
        </xsd:choice>
      </xsd:sequence>
    </xsd:extension>
  </xsd:complexContent>
</xsd:complexType>

<xsd:element name="export" type="tns:ExportMessage" substitutionGroup="tns:message"/>

贸易参考元素：

<xsd:complexType name="TradeReference">
  <xsd:sequence>
    <xsd:element name="tradeId" type="tns:TradeId" maxOccurs="unbounded" minOccurs="0"/>
  </xsd:sequence>
  <xsd:attribute name="href" use="optional"/>
  <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
</xsd:complexType>

<xsd:element name="tradeReference" type="tns:TradeReference"/>

和服务：

exportEntities(export: ns32:ExportMessage) -> message: ns30:Message, error: ns34:Error
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