Terry J. Reedy added the comment:

Reading Antoine's message more carefully, and the cited doc line, the generic 
fix to prevent the warning would be

try:
 <__del__ body>
except Exception:
  pass

The question is, do we only want to block the warning when someone calls Popen 
with the wrong number of arguments, or always?

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