Python package

Merge branch 'master' into optimize-contextj #195

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Run time

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Job	Run time
mypy (3.8)	11s
build (3.7)	15s
mypy (3.9)	14s
build (3.8)	11s
mypy (3.10)	13s
build (3.9)	19s
mypy (3.11)	16s
build (3.10)	15s
build (3.11)	9s
mypy (3.12)	12s
build (3.12)	18s
build (pypy-3.9)	31s
build (3.5, ubuntu-20.04)	15s
build (3.6, ubuntu-20.04)	24s
	3m 43s