solve WARNINGs #1265

Job	Run time
docs_check (3.10)	1m 1s
tutorial_tests (3.8, ubuntu-latest)	1m 22s
build (3.8, ubuntu-latest)	1m 16s
tutorial_tests (3.8, windows-latest)	3m 6s
linting (3.10, ubuntu-latest)	56s
build (3.8, windows-latest)	2m 47s
tutorial_tests (3.9, ubuntu-latest)	1m 17s
linting (3.10, windows-latest)	1m 56s
build (3.9, ubuntu-latest)	1m 33s
tutorial_tests (3.9, windows-latest)	3m 20s
build (3.9, windows-latest)	3m 10s
tutorial_tests (3.10, ubuntu-latest)	1m 15s
build (3.10, ubuntu-latest)	1m 25s
tutorial_tests (3.10, windows-latest)	2m 23s
build (3.10, windows-latest)	2m 51s
tutorial_tests (3.11, ubuntu-latest)	1m 18s
build (3.11, ubuntu-latest)	1m 9s
tutorial_tests (3.11, windows-latest)	3m 22s
build (3.11, windows-latest)	2m 52s
	38m 19s

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