Refine the formatting of generated Python3 code #1139

Job	Run time
cpp-lib-build (macos-12, clang, ON)	1m 6s
cpp-lib-build (macos-12, clang, OFF)	1m 1s
build (macos-12, tool)	1m 51s
build (macos-12, cpp)	17m 42s
cpp-lib-build (macos-12, gcc, ON)	53s
build (macos-12, csharp)	6m 11s
cpp-lib-build (macos-12, gcc, OFF)	1m 2s
build (macos-12, dart)	4m 3s
cpp-lib-build (ubuntu-20.04, clang, ON)	1m 5s
build (macos-12, go)	3m 17s
cpp-lib-build (ubuntu-20.04, clang, OFF)	1m 6s
build (macos-12, java)	1m 29s
cpp-lib-build (ubuntu-20.04, gcc, ON)	39s
build (macos-12, javascript)	2m 16s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	1m 1s
build (macos-12, typescript)	16m 15s
cpp-lib-build (windows-2022, clang, ON)	4m 4s
build (macos-12, php)	20m 18s
cpp-lib-build (windows-2022, clang, OFF)	4m 28s
build (macos-12, python3)	1m 44s
cpp-lib-build (windows-2022, cl)	4m 42s
build (ubuntu-20.04, tool)	58s
build (ubuntu-20.04, cpp)	16m 6s
build (ubuntu-20.04, csharp)	5m 5s
build (ubuntu-20.04, dart)	3m 38s
build (ubuntu-20.04, go)	2m 27s
build (ubuntu-20.04, java)	1m 7s
build (ubuntu-20.04, javascript)	1m 24s
build (ubuntu-20.04, typescript)	10m 39s
build (ubuntu-20.04, php)	1m 27s
build (ubuntu-20.04, python3)	1m 5s
build (windows-2022, tool)	1m 47s
build (windows-2022, cpp)	22m 18s
build (windows-2022, csharp)	6m 31s
build (windows-2022, dart)	4m 15s
build (windows-2022, go)	5m 25s
build (windows-2022, java)	1m 58s
build (windows-2022, javascript)	2m 12s
build (windows-2022, typescript)	20m 55s
build (windows-2022, php)	1m 55s
build (windows-2022, python3)	1m 45s
	3h 29m 10s

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