How do I validate a JSON Schema schema, in Python?

Using jsonschema, you can validate a schema against the meta-schema. The core meta-schema is here, but jsonschema bundles it so downloading it is unnecessary.

from jsonschema import Draft3Validator
my_schema = json.loads(my_text_file) #or however else you end up with a dict of the schema
Draft3Validator.check_schema(my_schema)