[Python] How to disable introspection on graphene-python?

The docs give this explanation:

validation_errors = validate(
schema=schema.graphql_schema,
document_ast=parse('THE QUERY'),
rules=(
DisableIntrospection,
)


... but leave a "THE QUERY" placeholder for the document_ast parameter.

What should be used so that introspection is disabled for all queries?

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