[issue12085] subprocess.Popen.__del__ raises AttributeError if __init__ was called with an invalid argument list

[Terry J. Reedy]

Terry J. Reedy added the comment:

Right. If _internal_poll raises, it should not be masked as that would be a true bug.

More research. 'self.returncode = None' comes before the only call to the appropriate posix/windows version of ._execute_child(), which is the only place where '_child_created = True'. So class level
    _child_created = False  # needed for __del__ if __init__ call fails
should be sufficient. With that added,
        self._child_created = False
in __init__ would not be really needed. 

As I said on pydev, making the warning a Warning would be a different issue.

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<http://bugs.python.org/issue12085>
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