linux

Minor optimizations in Python code #16129

Job	Run time
Arch / PyPy	18m 53s
Arch Linux	19m 52s
CUDA (on Arch)	7m 7s
Ubuntu Rolling (gcc, g++)	16m 29s
Fedora	20m 11s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	11m 41s
Gentoo	20m 22s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	11m 54s
OpenSUSE	15m 32s
Ubuntu Rolling (clang, clang++)	19m 39s
Ubuntu Bionic	14m 41s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	13m 48s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	10m 36s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	11m 37s
	3h 32m 22s

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