Refine the formatting of generated Python3 code #1137

Job	Run time
cpp-lib-build (macos-12, clang, ON)	1m 3s
cpp-lib-build (macos-12, clang, OFF)	1m 1s
build (macos-12, tool)	1m 21s
cpp-lib-build (macos-12, gcc, ON)	12s
build (macos-12, cpp)	10m 17s
cpp-lib-build (macos-12, gcc, OFF)	58s
build (macos-12, csharp)	7m 54s
cpp-lib-build (ubuntu-20.04, clang, ON)	55s
build (macos-12, dart)	3m 51s
cpp-lib-build (ubuntu-20.04, clang, OFF)	1m 23s
build (macos-12, go)	3m 35s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 6s
build (macos-12, java)	1m 47s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	2m 29s
build (macos-12, javascript)	1m 55s
cpp-lib-build (windows-2022, clang, ON)	3m 44s
build (macos-12, typescript)	6m 42s
cpp-lib-build (windows-2022, clang, OFF)	4m 35s
build (macos-12, php)	3m 6s
cpp-lib-build (windows-2022, cl)	4m 31s
build (macos-12, python3)	1m 31s
build (ubuntu-20.04, tool)	56s
build (ubuntu-20.04, cpp)	10m 15s
build (ubuntu-20.04, csharp)	5m 0s
build (ubuntu-20.04, dart)	3m 50s
build (ubuntu-20.04, go)	2m 32s
build (ubuntu-20.04, java)	1m 16s
build (ubuntu-20.04, javascript)	1m 20s
build (ubuntu-20.04, typescript)	10m 8s
build (ubuntu-20.04, php)	1m 37s
build (ubuntu-20.04, python3)	1m 2s
build (windows-2022, tool)	1m 42s
build (windows-2022, cpp)	10m 36s
build (windows-2022, csharp)	7m 29s
build (windows-2022, dart)	4m 49s
build (windows-2022, go)	4m 47s
build (windows-2022, java)	1m 48s
build (windows-2022, javascript)	2m 44s
build (windows-2022, typescript)	8m 10s
build (windows-2022, php)	2m 2s
build (windows-2022, python3)	1m 45s
	2h 28m 44s

Provide feedback