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> The question that remains is, does removing the {} change the output
> obtained from a command sequence in any way?
{} are used to group output from the commands into one stream. I believe the stdout and stderr arguments to Popen allow us to get compatible behavior. Tests need to prove that, of course.
> Which makes me wonder if getoutput/getstatusoutput should just be
> documentationally deprecated instead. (I never use them myself, FWIW)
They were relocated from the commands module, resulting in slightly overlapping functions that don’t share a naming patter: call, check_call, getoutput, getstatusoutput.