Separate subprocess writing/parsing into their own functions #325

Job	Run time
tox-jobs (doc)	27s
ubuntu-latest - 3.12	31s
tox-jobs (pep8)	19s
macos-latest - 3.12	38s
windows-latest - 3.12	1m 0s
ubuntu-latest - pypy3.10	1m 6s
ubuntu-latest - pypy3.9	1m 3s
ubuntu-latest - pypy3.8	1m 3s
ubuntu-latest - 3.8	27s
ubuntu-latest - 3.9	33s
ubuntu-latest - 3.10	30s
ubuntu-latest - 3.11	29s
ubuntu-latest - 3.13-dev free-threading	1m 49s
	9m 55s

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