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[Python-ideas] Adding a subprocess.CompletedProcess class

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The subprocess module provides some nice tools to control the details ofrunning a process, but it's still rather awkward for common use cases whereyou want to execute a command in one go.* There are three high-level functions: call, check_call and check_output,which all do very similar things with different return/raise behaviours* Their naming is not very clear (check_output doesn't check the output, itchecks the return code and captures the output)* You can't use any of them if you want stdout and stderr separately.* You can get stdout and returncode from check_output, but it's not exactlyobvious:try:    stdout = check_output(...)    returncode = 0except CalledProcessError as e:    stdout = e.output    returncode = e.returncodeI think that what these are lacking is a good way to represent a processthat has already finished (as opposed to Popen, which is mostly designed tohandle a running process). So I would:1. Add a CompletedProcess class:* Attributes stdout and stderr are bytes if the relevant stream was piped,None otherwise, like the return value of Popen.communicate()* Attribute returncode is the exit status* ? Attribute cmd is the list of arguments the process ran with (not sureif this should be there or not)* Method cp.check_returncode() raises CalledProcessError if returncode !=0, inspired by requests' Response.raise_for_status()2. Add a run() function - like call/check_call/check_output, but returns aCompletedProcess instance3. Deprecate call/check_call/check_output, but leave them aroundindefinitely, since lots of existing code relies on them.Thanks,Thomas-------------- next part --------------An HTML attachment was scrubbed...URL: <http://mail.python.org/pipermail/python-ideas/attachments/20150127/04dcbfa2/attachment.html>

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