code: def const(validator, const, instance, schema):
      if not equal(instance, const):
          yield ValidationError("%r was expected" % (const,))
  
imports: import re
  from jsonschema._utils import ensure_list, equal, extras_msg, find_additional_properties, types_msg, unbool, uniq
  from jsonschema.exceptions import FormatError, ValidationError
  from jsonschema.compat import iteritems
label_desc: Use image node_id 6 for calling a global function with example usage: const(validator, const, instance, schema) without return types