python threading线程再次开启多线程AttributeError错误应对方案是什么，,一个简单的例子重现这个报

python threading线程再次开启多线程AttributeError错误应对方案是什么，,一个简单的例子重现这个报

一个简单的例子重现这个报错:

from multiprocessing.dummy import Pool as ThreadPoolimport threadingdef work():    l = [1,2,3]    pool = ThreadPool(3)    pool.map(work2,l)    pool.close()    pool.join()if __name__ == '__main__':    t = threading.Thread(target=work)    t.start()

错误信息：

    Exception in thread Thread-1:Traceback (most recent call last):  File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner    self.run()  File "/usr/lib/python2.7/threading.py", line 504, in run    self.__target(*self.__args, **self.__kwargs)  File "/home/eggeek/palendar/geodata/operation/praser.py", line 7, in work    pool = ThreadPool(3)  File "/usr/lib/python2.7/multiprocessing/dummy/__init__.py", line 150, in Pool    return ThreadPool(processes, initializer, initargs)  File "/usr/lib/python2.7/multiprocessing/pool.py", line 685, in __init__    Pool.__init__(self, processes, initializer, initargs)  File "/usr/lib/python2.7/multiprocessing/pool.py", line 136, in __init__    self._repopulate_pool()  File "/usr/lib/python2.7/multiprocessing/pool.py", line 199, in _repopulate_pool    w.start()  File "/usr/lib/python2.7/multiprocessing/dummy/__init__.py", line 73, in start    self._parent._children[self] = NoneAttributeError: 'Thread' object has no attribute '_children'

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