Change python implementation to increase speed in pcan send #509

Job	Run time
static-code-analysis	48s
docs	1m 39s
format	25s
build	27s
test (ubuntu-latest, false, 3.8)	3m 4s
test (ubuntu-latest, false, 3.9)	2m 48s
test (ubuntu-latest, false, 3.10)	3m 4s
test (ubuntu-latest, false, 3.11)	2m 52s
test (ubuntu-latest, false, pypy-3.8)	4m 8s
test (ubuntu-latest, false, pypy-3.9)	4m 21s
test (macos-latest, false, 3.8)	2m 24s
test (macos-latest, false, 3.9)	2m 1s
test (macos-latest, false, 3.10)	2m 8s
test (macos-latest, false, 3.11)	6m 12s
test (macos-latest, false, pypy-3.8)	4m 31s
test (macos-latest, false, pypy-3.9)	5m 14s
test (windows-latest, false, 3.8)	2m 34s
test (windows-latest, false, 3.9)	2m 50s
test (windows-latest, false, 3.10)	3m 15s
test (windows-latest, false, 3.11)	2m 23s
test (windows-latest, false, pypy-3.8)	6m 46s
test (windows-latest, false, pypy-3.9)	8m 43s
test (ubuntu-latest, true, 3.12.0-alpha - 3.12.0)	3m 52s
upload_pypi	0s
coveralls	6s
	1h 16m 35s

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