Fix enums in python 3
Fix enums in python 3

PyTables/PyTables,cpcloud/PyTables,mohamed-ali/PyTables,gdementen/PyTables,rabernat/PyTables,rdhyee/PyTables,jack-pappas/PyTables,cpcloud/PyTables,dotsdl/PyTables,cpcloud/PyTables,avalentino/PyTables,tp199911/PyTables,gdementen/PyTables,PyTables/PyTables,andreabedini/PyTables,mohamed-ali/PyTables,rabernat/PyTables,jennolsen84/PyTables,joonro/PyTables,rabernat/PyTables,FrancescAlted/PyTables,jack-pappas/PyTables,jennolsen84/PyTables,avalentino/PyTables,rdhyee/PyTables,PyTables/PyTables,andreabedini/PyTables,tp199911/PyTables,gdementen/PyTables,FrancescAlted/PyTables,tp199911/PyTables,joonro/PyTables,gdementen/PyTables,tp199911/PyTables,avalentino/PyTables,dotsdl/PyTables,jennolsen84/PyTables,joonro/PyTables,jack-pappas/PyTables,dotsdl/PyTables,jennolsen84/PyTables,rdhyee/PyTables,jack-pappas/PyTables,rdhyee/PyTables,joonro/PyTables,cpcloud/PyTables,mohamed-ali/PyTables,andreabedini/PyTables,FrancescAlted/PyTables,andreabedini/PyTables,rabernat/PyTables,dotsdl/PyTables,jack-pappas/PyTables,mohamed-ali/PyTables