Check if child process has terminated. Returns returncode attribute. This method is called by __del__, so it can only refer to objects in its local scope.
(self, _deadstate=None,
_WaitForSingleObject=_subprocess.WaitForSingleObject,
_WAIT_OBJECT_0=_subprocess.WAIT_OBJECT_0,
_GetExitCodeProcess=_subprocess.GetExitCodeProcess)
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