Gregory P. Smith <g...@krypto.org> added the comment:

I didn't initially like the idea of __exit__ blocking on another
process... but the zombie issue is real does make me think we should
reconsider this and have it wait().

It is a backwards incompatible change if anyone has started using the
Popen context manager to launch a long running subprocess that they
did not want to wait for.  That should be exceedingly rare.

I say change the behavior to wait() in 3.3, 3.2.1 and 2.7.2.  Keep the
note in the documentation and turn it into something that stands out
better like a note or a warning suggesting that people always call
wait() after the Popen context manager exits if they need to be
compatible with 2.7.1 or earlier.

----------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12044>
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