subprocess.Popen() should allow capturing output and sending it to stdout and stderr

[pprindeville]

BPO	47222
Nosy	@gpshead, @pprindeville
PRs	gh-91378: Allow subprocess pass-thru with stdout/stderr capture #32344

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-04-04.22:52:49.296>
labels = ['type-feature', 'library', '3.11']
title = 'subprocess.Popen() should allow capturing output and sending it to stdout and stderr'
updated_at = <Date 2022-04-05.21:08:52.185>
user = 'https://github.com/pprindeville'

bugs.python.org fields:

activity = <Date 2022-04-05.21:08:52.185>
actor = 'pprindeville'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-04-04.22:52:49.296>
creator = 'pprindeville'
dependencies = []
files = []
hgrepos = []
issue_num = 47222
keywords = ['patch']
message_count = 1.0
messages = ['416703']
nosy_count = 2.0
nosy_names = ['gregory.p.smith', 'pprindeville']
pr_nums = ['32344']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue47222'
versions = ['Python 3.11']

[pprindeville]

I'd like to see handlers exposes for the stdout and stderr pipe-reading threads so that I could customize what's done with the data as it's read.

I might, for instance, want to:

(1) accumulate it into a buffer;
(2) copy it onto sys.stdout or sys.stderr, respectively;
(3) send it to a logging object;

or some combination of the above, possibly all of them.