Get examples flake8-clean

.github/workflows/ci.yml

.gitlab-ci.yml

examples/black-hole-accretion.py

examples/demo-struct-reduce.py

examples/demo_elementwise.py

examples/demo_elementwise_complex.py

examples/demo_meta_codepy.py

examples/dump-performance.py

examples/dump-properties.py

examples/median-filter.py

examples/n-body.py

examples/narray.py

examples/pi-monte-carlo.py

examples/transpose.py

setup.cfg