Martin Panter added the comment:

I don’t know enough about process groups and sessions to properly review, but 
some things that stand out:

* Patch is missing documentation and tests
* If the “killpg” just wraps os.killpg, perhaps adding the method is not 
justified
* Are there any race conditions with killing a process group that has already 
exited. When does a process group get freed and potentially reused (so you may 
kill the wrong group)? The “send_signal” method (and others) have a check to 
avoid signalling an unrelated process.
* The method is called killpg, and the doc string mentions SIGKILL, but the 
implementation says SIGTERM
* What happens if you use killpg without starting a new session? If it kills 
the parent process as well, that sounds like a source of subtle bugs that may 
only be detected in unexpected cases (e.g. Ctrl+C or timeout)
* Be aware of Issue 25942. It is not clear what should happen to the child 
process(es) when the timeout happens, or when the “communicate” call is 
interrupted.
* What platforms does this support and what happens if there is no platform 
support?

----------
nosy: +martin.panter
stage:  -> patch review
type: behavior -> enhancement
versions: +Python 3.7 -Python 3.5, Python 3.6

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<http://bugs.python.org/issue26534>
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