Refine the formatting of generated Python3 code #1162

Job	Run time
cpp-lib-build (macos-12, clang, ON)	1s
cpp-lib-build (macos-12, clang, OFF)	1s
cpp-lib-build (macos-12, gcc, ON)	1s
build (macos-12, tool)	1m 18s
cpp-lib-build (macos-12, gcc, OFF)	1s
build (macos-12, cpp)	5m 56s
cpp-lib-build (ubuntu-20.04, clang, ON)	1m 0s
build (macos-12, csharp)	5m 25s
cpp-lib-build (ubuntu-20.04, clang, OFF)	58s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 26s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	2m 22s
build (macos-12, dart)	3m 37s
cpp-lib-build (windows-2022, clang, ON)	1m 45s
build (macos-12, go)	3m 21s
build (macos-12, java)	1m 34s
cpp-lib-build (windows-2022, clang, OFF)	1m 54s
build (macos-12, javascript)	1m 49s
cpp-lib-build (windows-2022, cl)	4m 14s
build (macos-12, typescript)	1s
build (macos-12, php)	1m 42s
build (macos-12, python3)	1m 27s
build (ubuntu-20.04, tool)	1m 9s
build (ubuntu-20.04, cpp)	5m 50s
build (ubuntu-20.04, csharp)	5m 34s
build (ubuntu-20.04, dart)	3m 58s
build (ubuntu-20.04, go)	2m 32s
build (ubuntu-20.04, java)	1m 6s
build (ubuntu-20.04, javascript)	1m 20s
build (ubuntu-20.04, typescript)	5m 57s
build (ubuntu-20.04, php)	1m 34s
build (ubuntu-20.04, python3)	1m 7s
build (windows-2022, tool)	1m 17s
build (windows-2022, cpp)	6m 5s
build (windows-2022, csharp)	5m 31s
build (windows-2022, dart)	4m 12s
build (windows-2022, go)	5m 23s
build (windows-2022, java)	1m 51s
build (windows-2022, javascript)	2m 18s
build (windows-2022, typescript)	4m 7s
build (windows-2022, php)	2m 24s
build (windows-2022, python3)	1m 49s
	1h 45m 57s

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