**Description of the false positive** `rdflib.Graph.add()` has one required argument, not zero. See also https://github.com/common-workflow-language/schema_salad/blob/master/typeshed/2and3/rdflib/graph.pyi#L22 **URL to the alert on the project page on LGTM.com** https://lgtm.com/projects/g/common-workflow-language/schema_salad/snapshot/4bd7c11d7af79fe961dc4225efdc090378928ddb/files/schema_salad/jsonld_context.py#xdbc2bae130811f31:1