Tipo não encontrado wsdl python suds client - suds.TypeNotFound

Quero consumir o serviço da web descrito a seguir:

http://www.content.de/api/clientservices.php?wsdl

Estou usando python 2.7.xeespuma versão 0.4.

O que eu tentei 1

from suds.client import Client
url = 'http://www.content.de/api/clientservices.php?wsdl'
client = Client(url) 

Resultado

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/client.py", line 119, in __init__
sd = ServiceDefinition(self.wsdl, s)
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/servicedefinition.py", line 57, in __init__
self.addports()
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/servicedefinition.py", line 85, in addports
method = (m.name, binding.param_defs(m))
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/bindings/rpc.py", line 39, in param_defs          
return self.bodypart_types(method)
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/bindings/binding.py", line 441, in bodypart_types 
raise TypeNotFound(query.ref)
suds.TypeNotFound: Type not found: '(, http://www.w3.org/2001/XMLSchema, )'

O que eu tentei 2

Depois de pesquisar no stackoverflow, também tentei:

from suds.xsd.doctor import ImportDoctor, Import
from suds.client import Client
url = 'http://www.content.de/api/clientservices.php?wsdl'
imp = Import('http://schemas.xmlsoap.org/soap/encoding/')
imp.filter.add('urn:ClientServices')
client = Client(url, plugins=[ImportDoctor(imp)])

Resultado

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds,/client.py", line 119, in __init__
sd = ServiceDefinition(self.wsdl, s)
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/servicedefinition.py", line 57, in __init__
self.addports()
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/servicedefinition.py", line 85, in addports
method = (m.name, binding.param_defs(m))
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/bindings/rpc.py", line 39, in param_defs
return self.bodypart_types(method)
File "/home/xubuntu/.virtualenvs/adwiz/local/lib/python2.7/site-packages/suds/bindings/binding.py", line 441, in bodypart_types
raise TypeNotFound(query.ref)
suds.TypeNotFound: Type not found: '(, http://www.w3.org/2001/XMLSchema, )'

Edite após ativar o log.DEBUG Também recebo a mensagem:

DEBUG:suds.xsd.query:(u'', u'http://www.w3.org/2001/XMLSchema'), not-found 

pouco antes da exceção

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