fix python specification #53

Job	Run time
tutorials (3.8, ubuntu-20.04)	2m 6s
readme (3.8, ubuntu-20.04)	1m 22s
devel (3.10, ubuntu-latest)	3m 16s
tutorials (3.9, ubuntu-20.04)	2m 18s
unit (3.8, ubuntu-20.04)	25s
readme (3.8, macos-latest)	2m 22s
unit (3.8, macos-latest)	55s
readme (3.9, ubuntu-20.04)	1m 43s
tutorials (3.10, ubuntu-20.04)	2m 21s
unit (3.9, ubuntu-20.04)	20s
readme (3.9, macos-latest)	1m 40s
unit-mlprimitives (3.8, ubuntu-20.04)	1m 38s
tutorials (3.11, ubuntu-20.04)	2m 9s
readme (3.10, ubuntu-20.04)	1m 36s
unit (3.9, macos-latest)	18s
unit-mlprimitives (3.8, macos-latest)	2m 10s
readme (3.10, macos-latest)	1m 14s
unit (3.10, ubuntu-20.04)	21s
readme (3.11, ubuntu-20.04)	1m 47s
unit-mlprimitives (3.9, ubuntu-20.04)	1m 55s
unit (3.10, macos-latest)	20s
readme (3.11, macos-latest)	1m 36s
unit-mlprimitives (3.9, macos-latest)	1m 54s
unit (3.11, ubuntu-20.04)	16s
unit-mlprimitives (3.10, ubuntu-20.04)	1m 46s
unit (3.11, macos-latest)	23s
unit-mlprimitives (3.10, macos-latest)	1m 24s
unit (3.12, ubuntu-20.04)	31s
unit-mlprimitives (3.11, ubuntu-20.04)	1m 52s
unit (3.12, macos-latest)	19s
unit-mlprimitives (3.11, macos-latest)	1m 30s
unit (3.13, ubuntu-20.04)	30s
unit (3.13, macos-latest)	24s
	44m 41s

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