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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