I believe I'm still encountering this issue in 2.7:


Exception in thread Thread-3:
Traceback (most recent call last):
  File "/opt/python/2.7/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/opt/python/2.7/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/opt/python/2.7/lib/python2.7/multiprocessing/pool.py", line 347, in _handle_results
    task = get()
TypeError: ('__init__() takes at least 3 arguments (1 given)', <class 'subprocess.CalledProcessError'>, ())