Python：多重处理-肥皂水-_pickle.PicklingError：无法腌制 <class> 属性查找失败

Question

I'm making SOAP WSDL connection and then I want to run function in another procces (threading is not suitable)

from suds.client import Client

class dTest:

def setup(self, client):
    ws = Client("http://localhost?wsdl")

    # then I use some SOAP API methods and return dictionary with results
    return result_dict


def test(self, name):
    # in this function I use another SOAP API methods
    return

def main(self, client):

    result_dict = self.setup(client)

    for  name, num in result_dict.items():
        p = multiprocessing.Process(target=self.test, args=[name])
        p.start() # <- on this line I have an error
        p.join(timeout)
        if p.is_alive():
            p.terminate

Then I have an error

File "D:\IPWStest\test\dTest.py", line 318, in main
    p.start()
  File "C:\Python34\lib\multiprocessing\process.py", line 105, in start
    self._popen = self._Popen(self)
  File "C:\Python34\lib\multiprocessing\context.py", line 212, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Python34\lib\multiprocessing\context.py", line 313, in _Popen
    return Popen(process_obj)
  File "C:\Python34\lib\multiprocessing\popen_spawn_win32.py", line 66, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Python34\lib\multiprocessing\reduction.py", line 59, in dump
    ForkingPickler(file, protocol).dump(obj)
_pickle.PicklingError: Can't pickle <class 'suds.sudsobject.UserCredentialsType'>: attribute lookup UserCredentialsType on suds.sudsobject failed               

I can't find any solution for this issue. How can I pickle this line?

result_dict = self.setup(client)

Is another decision may be exist? Can anyone help me? What does this error means?

Answer 1

Problem was in setup function. Web-service connection ws in setup uses in test function. That's why this object cann't be pickle. If you using multiprocessing and suds or any similar lib, new connection should be created in every new process.