python - Using fabric to run parallel task -

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i want use fabric lib run parallel task via ssh , , defined script following(running on windows) :

from fabric.api import *   env.hosts=[       'builder@10.0.1.88:22',       'builder@10.0.1.80:22',       'builder@10.0.1.57:22',       'builder@10.0.1.58:22',       'builder@10.0.1.59:22',         ]         env.password = 'xxxxxx'   @parallel(pool_size=5)  def test_task():   space_info = run('df -h | grep space')

but when run script , return following errors , can body me what's wrong ? many thanks~

[builder@10.0.1.88:22] executing task 'update_setting_remote'  [builder@10.0.1.80:22] executing task 'update_setting_remote'  [builder@10.0.1.57:22] executing task 'update_setting_remote'  [builder@10.0.1.58:22] executing task 'update_setting_remote'  [builder@10.0.1.59:22] executing task 'update_setting_remote'  traceback (most recent call last):  file "c:\python27\lib\site-packages\fabric\main.py", line 745, in main   *args, **kwargs  file "c:\python27\lib\site-packages\fabric\tasks.py", line 412, in execute   ran_jobs = jobs.run()  file "c:\python27\lib\site-packages\fabric\job_queue.py", line 137, in run   _advance_the_queue()  file "c:\python27\lib\site-packages\fabric\job_queue.py", line 122, in _advance_the_queue   job.start()  file "c:\python27\lib\multiprocessing\process.py", line 130, in start   self._popen = popen(self)  file "c:\python27\lib\multiprocessing\forking.py", line 277, in __init__   dump(process_obj, to_child, highest_protocol)  file "c:\python27\lib\multiprocessing\forking.py", line 199, in dump   forkingpickler(file, protocol).dump(obj)  file "c:\python27\lib\pickle.py", line 224, in dump   self.save(obj)  file "c:\python27\lib\pickle.py", line 331, in save   self.save_reduce(obj=obj, *rv)  file "c:\python27\lib\pickle.py", line 419, in save_reduce   save(state)  file "c:\python27\lib\pickle.py", line 286, in save   f(self, obj) # call unbound method explicit self  file "c:\python27\lib\pickle.py", line 649, in save_dict   self._batch_setitems(obj.iteritems())  file "c:\python27\lib\pickle.py", line 681, in _batch_setitems   save(v)  file "c:\python27\lib\pickle.py", line 286, in save   f(self, obj) # call unbound method explicit self  file "c:\python27\lib\pickle.py", line 748, in save_global   (obj, module, name))  pickle.picklingerror: can't pickle <function inner @ 0x01fdd1f0>: it's not found fabric.tasks.inner  traceback (most recent call last):  file "<string>", line 1, in <module> file "c:\python27\lib\multiprocessing\forking.py", line 380, in main   prepare(preparation_data)  file "c:\python27\lib\multiprocessing\forking.py", line 488, in prepare   assert main_name not in sys.modules, main_name  assertionerror: __main__


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