core: corrigindo problemas apontados pelo flake8
core: corrigindo problemas apontados pelo flake8

devincachu/devincachu-2013,devincachu/devincachu-2013,devincachu/devincachu-2013,devincachu/devincachu-2014,devincachu/devincachu-2014,devincachu/devincachu-2013,devincachu/devincachu-2014