pep8 cleanup
pep8 cleanup


Former-commit-id: b8adca4a9b7f40b22ec0ca50d2e8bcc9e1d440c9 [formerly b8adca4a9b7f40b22ec0ca50d2e8bcc9e1d440c9 [formerly 0db7098b28f962333a9458f036d5f4c5605c1e9a]]
Former-commit-id: d7c2af09fced3022a76ef5a8f769ad0f40756da1
Former-commit-id: 59241e138674b790f77f9360d535b927f5eb8f42
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine