关于python：在赋值之前引用的局部变量’sresult’

local variable 'sresult' referenced before assignment

尝试使用pp时遇到了多个问题。我运行的是python2.6和pp 1.6.0 rc3。使用以下测试代码：

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import pp
nodes=('mosura02','mosura03','mosura04','mosura05','mosura06',
'mosura09','mosura10','mosura11','mosura12')

def pptester():
js=pp.Server(ppservers=nodes)
tmp=[]
for i in range(200):
tmp.append(js.submit(ppworktest,(),(),('os',)))
return tmp

def ppworktest():
return os.system("uname -a")

给出以下结果：

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In [10]: Exception in thread run_local:
Traceback (most recent call last):
File"/usr/lib64/python2.6/threading.py", line 525, in __bootstrap_inner
self.run()
File"/usr/lib64/python2.6/threading.py", line 477, in run
self.__target(*self.__args, **self.__kwargs)
File"/home/wkerzend/python_coala/lib/python2.6/site-packages/pp.py", line 751, in _run_local
job.finalize(sresult)
UnboundLocalError: local variable 'sresult' referenced before assignment

Exception in thread run_local:
Traceback (most recent call last):
File"/usr/lib64/python2.6/threading.py", line 525, in __bootstrap_inner
self.run()
File"/usr/lib64/python2.6/threading.py", line 477, in run
self.__target(*self.__args, **self.__kwargs)
File"/home/wkerzend/python_coala/lib/python2.6/site-packages/pp.py", line 751, in _run_local
job.finalize(sresult)
UnboundLocalError: local variable 'sresult' referenced before assignment

Exception in thread run_local:
Traceback (most recent call last):
File"/usr/lib64/python2.6/threading.py", line 525, in __bootstrap_inner
self.run()
File"/usr/lib64/python2.6/threading.py", line 477, in run
self.__target(*self.__args, **self.__kwargs)
File"/home/wkerzend/python_coala/lib/python2.6/site-packages/pp.py", line 751, in _run_local
job.finalize(sresult)
UnboundLocalError: local variable 'sresult' referenced before assignment

Exception in thread run_local:
Traceback (most recent call last):
File"/usr/lib64/python2.6/threading.py", line 525, in __bootstrap_inner
self.run()
File"/usr/lib64/python2.6/threading.py", line 477, in run
self.__target(*self.__args, **self.__kwargs)
File"/home/wkerzend/python_coala/lib/python2.6/site-packages/pp.py", line 751, in _run_local
job.finalize(sresult)
UnboundLocalError: local variable 'sresult' referenced before assignment

非常感谢您的帮助。