Suds（Python SOAP客户端） - 不支持的操作数类型

Question

我正在尝试使用 eBay Trading SOAP API ：

from suds.client import Client
print Client('http://developer.ebay.com/webservices/latest/ebaySvc.wsdl')

我得到了这个：

ERROR:suds.servicedefinition:unsupported operand type(s) for +=: 'NoneType' and 'str'
Traceback (most recent call last):
  File "build/bdist.macosx-10.6-universal/egg/suds/servicedefinition.py", line 245, in __unicode__
    return self.description()
  File "build/bdist.macosx-10.6-universal/egg/suds/servicedefinition.py", line 223, in description
    sig.append(self.xlate(p[1]))
  File "build/bdist.macosx-10.6-universal/egg/suds/servicedefinition.py", line 189, in xlate
    name += '[]'
TypeError: unsupported operand type(s) for +=: 'NoneType' and 'str'

Suds ( https://fedorahosted.org/suds/ )  version: 0.4.1 (beta)  build: R705-20101207

unsupported operand type(s) for +=: 'NoneType' and 'str'

发生了什么事？

查找API 工作正常：

Client('http://developer.ebay.com/webservices/finding/latest/FindingService.wsdl')

提前致谢， 艾格。