Fixed Python 3 error
Fixed Python 3 error


Former-commit-id: de0c1eeda23ade5902ffd4bcd69bf0f2e3b32d42 [formerly de0c1eeda23ade5902ffd4bcd69bf0f2e3b32d42 [formerly a620d9edf6c75388401172cbea09e7d70a793745]]
Former-commit-id: d88f5021f19304c034b679a6406aedbd5271ff89
Former-commit-id: bb2d0e735e707e91e18aa107ea08df3cef0710be
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine