re-add six import
re-add six import
common-workflow-language/schema_salad,common-workflow-language/schema_salad,manu-chroma/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad,manu-chroma/schema_salad,common-workflow-language/schema_salad,common-workflow-language/schema_salad