Make examples correct #1012

Job	Run time
mypy	22s
build_python_27 (ubuntu-20.04, yes)	2m 47s
build (3.6, yes, ubuntu-20.04)	2m 44s
build_python_27 (ubuntu-20.04, no)	2m 53s
test_c_linux (0, x64)	57s
build (3.6, no, ubuntu-20.04)	2m 42s
build_python_27 (windows-latest, yes)	4m 22s
test_c_linux (0, x32)	1m 3s
build (3.7, yes, ubuntu-20.04)	2m 49s
build_python_27 (windows-latest, no)	4m 25s
test_c_linux (1, x64)	1m 42s
build (3.7, no, ubuntu-20.04)	2m 49s
test_c_linux (1, x32)	1m 37s
build (3.8, yes, ubuntu-20.04)	2m 20s
python_no_gil	3m 15s
build (3.8, no, ubuntu-20.04)	2m 27s
build (3.9, yes, ubuntu-20.04)	2m 25s
test_c_windows (x64)	1m 5s
build (3.9, no, ubuntu-20.04)	2m 32s
test_c_windows (win32)	1m 22s
build (3.10, yes, ubuntu-20.04)	2m 21s
build (3.10, no, ubuntu-20.04)	2m 18s
build (3.11, yes, ubuntu-20.04)	2m 4s
build (3.11, no, ubuntu-20.04)	2m 7s
build (3.12, yes, ubuntu-20.04)	2m 13s
build (3.12, no, ubuntu-20.04)	2m 14s
build (3.13-dev, yes, ubuntu-20.04)	2m 11s
build (3.13-dev, no, ubuntu-20.04)	2m 35s
build (3.12, yes, macos-12)	1s
build (3.12, no, windows-latest)	4m 1s
build (3.12, yes, windows-latest)	4m 28s
build (pypy2.7, no, ubuntu-latest)	1m 37s
build (pypy3.9, no, ubuntu-latest)	1m 54s
	1h 16m 42s

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