Reformat python automatically #994

Job	Run time
install (8.19.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 37m 6s
install (dev, Ubuntu, ubuntu-latest, 4.09.1)	40m 58s
install (8.19.0, macOS, macos-latest, 4.14.2)	34m 54s
install (8.18.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 40m 9s
install (dev, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml/oc...	1h 32m 2s
install (dev, macOS, macos-latest, 4.14.2)	58m 15s
install (8.19.0, Ubuntu, ubuntu-latest, 4.09.1)	41m 27s
install (8.18.0, macOS, macos-latest, 4.14.2)	42m 36s
install (8.18.0, Ubuntu, ubuntu-latest, 4.09.1)	42m 39s
install (8.20.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 34m 32s
install (8.20.0, Ubuntu, ubuntu-latest, 4.09.1)	40m 15s
install (8.20.0, macOS, macos-latest, 4.14.2)	31m 20s
	11h 56m 13s

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