Refine the formatting of generated Python3 code #1163

Job	Run time
cpp-lib-build (macos-12, clang, ON)	2m 26s
cpp-lib-build (macos-12, clang, OFF)	2m 32s
cpp-lib-build (macos-12, gcc, ON)	1m 4s
build (macos-12, tool)	1m 23s
cpp-lib-build (macos-12, gcc, OFF)	58s
build (macos-12, cpp)	14m 38s
build (macos-12, csharp)	5m 1s
cpp-lib-build (ubuntu-20.04, clang, ON)	53s
cpp-lib-build (ubuntu-20.04, clang, OFF)	1m 25s
build (macos-12, dart)	3m 43s
build (macos-12, go)	3m 46s
cpp-lib-build (ubuntu-20.04, gcc, ON)	1m 58s
build (macos-12, java)	1m 46s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	2m 22s
build (macos-12, javascript)	1m 55s
cpp-lib-build (windows-2022, clang, ON)	4m 50s
cpp-lib-build (windows-2022, clang, OFF)	5m 28s
build (macos-12, typescript)	11m 30s
build (macos-12, php)	1h 34m 15s
build (macos-12, python3)	1m 26s
cpp-lib-build (windows-2022, cl)	4m 45s
build (ubuntu-20.04, tool)	1m 5s
build (ubuntu-20.04, cpp)	15m 38s
build (ubuntu-20.04, csharp)	5m 11s
build (ubuntu-20.04, dart)	3m 37s
build (ubuntu-20.04, go)	2m 25s
build (ubuntu-20.04, java)	1m 2s
build (ubuntu-20.04, javascript)	1m 30s
build (ubuntu-20.04, typescript)	10m 9s
build (ubuntu-20.04, php)	1m 10s
build (ubuntu-20.04, python3)	1m 3s
build (windows-2022, tool)	1m 27s
build (windows-2022, cpp)	22m 41s
build (windows-2022, csharp)	6m 24s
build (windows-2022, dart)	3m 59s
build (windows-2022, go)	5m 23s
build (windows-2022, java)	1m 54s
build (windows-2022, javascript)	2m 37s
build (windows-2022, typescript)	20m 30s
build (windows-2022, php)	2m 0s
build (windows-2022, python3)	2m 8s
	4h 39m 57s

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