Refine the formatting of generated Python3 code #1151

Job	Run time
cpp-lib-build (macos-12, clang, ON)	2m 48s
build (macos-12, tool)	1m 39s
cpp-lib-build (macos-12, clang, OFF)	2m 31s
cpp-lib-build (macos-12, gcc, ON)	2m 45s
build (macos-12, cpp)	11m 12s
cpp-lib-build (macos-12, gcc, OFF)	4m 17s
build (macos-12, csharp)	5m 16s
cpp-lib-build (ubuntu-20.04, clang, ON)	1m 21s
build (macos-12, dart)	4m 35s
cpp-lib-build (ubuntu-20.04, clang, OFF)	2m 43s
build (macos-12, go)	3m 38s
cpp-lib-build (ubuntu-20.04, gcc, ON)	36s
build (macos-12, java)	1m 30s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	2m 46s
build (macos-12, javascript)	1m 48s
build (macos-12, typescript)	14m 31s
cpp-lib-build (windows-2022, clang, ON)	4m 8s
build (macos-12, php)	1h 16m 3s
cpp-lib-build (windows-2022, clang, OFF)	4m 47s
build (macos-12, python3)	1m 28s
cpp-lib-build (windows-2022, cl)	4m 17s
build (ubuntu-20.04, tool)	1m 3s
build (ubuntu-20.04, cpp)	15m 39s
build (ubuntu-20.04, csharp)	5m 18s
build (ubuntu-20.04, dart)	3m 48s
build (ubuntu-20.04, go)	2m 51s
build (ubuntu-20.04, java)	1m 22s
build (ubuntu-20.04, javascript)	1m 35s
build (ubuntu-20.04, typescript)	10m 23s
build (ubuntu-20.04, php)	1m 23s
build (ubuntu-20.04, python3)	1m 19s
build (windows-2022, tool)	1m 31s
build (windows-2022, cpp)	24m 15s
build (windows-2022, csharp)	7m 51s
build (windows-2022, dart)	4m 23s
build (windows-2022, go)	6m 23s
build (windows-2022, java)	1m 51s
build (windows-2022, javascript)	2m 58s
build (windows-2022, typescript)	20m 5s
build (windows-2022, php)	3m 25s
build (windows-2022, python3)	2m 6s
	4h 34m 8s

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