Refine the formatting of generated Python3 code #1150

Job	Run time
cpp-lib-build (macos-12, clang, ON)	2m 48s
cpp-lib-build (macos-12, clang, OFF)	3m 43s
build (macos-12, tool)	1m 23s
cpp-lib-build (macos-12, gcc, ON)	1s
build (macos-12, cpp)	12m 8s
cpp-lib-build (macos-12, gcc, OFF)	1s
build (macos-12, csharp)	8m 13s
cpp-lib-build (ubuntu-20.04, clang, ON)	2m 57s
build (macos-12, dart)	4m 35s
cpp-lib-build (ubuntu-20.04, clang, OFF)	4m 16s
build (macos-12, go)	3m 50s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 40s
build (macos-12, java)	4m 18s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	4m 11s
build (macos-12, javascript)	2m 2s
cpp-lib-build (windows-2022, clang, ON)	3m 19s
build (macos-12, typescript)	6m 17s
cpp-lib-build (windows-2022, clang, OFF)	4m 43s
build (macos-12, php)	7m 12s
cpp-lib-build (windows-2022, cl)	4m 20s
build (macos-12, python3)	1m 42s
build (ubuntu-20.04, tool)	1m 38s
build (ubuntu-20.04, cpp)	12m 2s
build (ubuntu-20.04, csharp)	5m 51s
build (ubuntu-20.04, dart)	4m 1s
build (ubuntu-20.04, go)	2m 55s
build (ubuntu-20.04, java)	1m 50s
build (ubuntu-20.04, javascript)	2m 3s
build (ubuntu-20.04, typescript)	10m 22s
build (ubuntu-20.04, php)	1m 36s
build (ubuntu-20.04, python3)	3m 32s
build (windows-2022, tool)	1m 59s
build (windows-2022, cpp)	12m 24s
build (windows-2022, csharp)	7m 44s
build (windows-2022, dart)	5m 2s
build (windows-2022, go)	6m 57s
build (windows-2022, java)	4m 29s
build (windows-2022, javascript)	2m 22s
build (windows-2022, typescript)	7m 58s
build (windows-2022, php)	2m 6s
build (windows-2022, python3)	1m 42s
	3h 3m 12s

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