Update Python < 3.8 (3.2 to 3.7) obsolete code and comments #3612

Job	Run time
docs	46s
diffcov	6m 34s
test (3.8, ubuntu-latest)	4m 18s
test_cygwin (39, windows-latest)	28m 57s
test (3.8, macos-latest)	10m 2s
test (3.8, windows-latest)	11m 1s
test (3.11, ubuntu-latest)	4m 26s
test (3.11, macos-latest)	12m 13s
test (3.11, windows-latest)	12m 39s
test (3.12, ubuntu-latest)	7m 18s
test (3.12, macos-latest)	13m 53s
test (3.12, windows-latest)	13m 41s
test (3.9, ubuntu-latest)	4m 28s
test (3.10, ubuntu-latest)	4m 36s
test (pypy3.9, ubuntu-latest, stdlib)	6m 51s
test (ubuntu-latest, 3.10, stdlib)	4m 21s
integration-test	0s
check	3s
release	0s
	2h 26m 7s

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