interface Identifiable {
 id: ID!
}
interface Resource implements Identifiable {
 id: ID!
 name: String!
}
type SomeResource implements Resource {
 id: ID!
 name: String!
}

File "/usr/local/lib/python3.6/site-packages/graphql/type/validate.py", line 91, in assert_valid_schema
 raise TypeError("\n\n".join(error.message for error in errors))
 TypeError: Type SomeResource must implement Identifiable because it is implemented by Resource.

type SomeResource implements Resource & Identifiable {
 id: ID!
 name: String
}