python - 赋值前引用的局部变量 'sresult'

Question

我在尝试使用 PP 时遇到了多个问题。我正在运行 python2.6 和 pp 1.6.0 rc3。使用以下测试代码:

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")

给我以下结果:

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 assignmentException 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 assignmentException 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 assignmentException 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

非常感谢任何帮助。

Answer 1

我无法阅读您的代码，因为它的格式不正确，但我可以告诉您您的确切问题:您试图从函数内部修改名为“sresult”的全局变量，但您没有添加此行到函数的开头:

全局结果

如果你没有声明一个全局变量，当你试图在函数内分配它时，Python会假设它是函数的本地变量，所以当你尝试修改或访问它时，Python会提示你还没有“绑定(bind)局部变量”(即为其赋值或赋予其值)。