code: def unused_variable_message(variable_name, op_name):
      if op_name:
          return (
              'Variable "${}" is never used in operation "{}".'.format(
                  variable_name, op_name
              )
          )
      return 'Variable "${}" is never used.'.format(variable_name)
  
file_path: wandb/wandb/vendor/graphql-core-1.1/wandb_graphql/validation/rules/no_unused_variables.py
imports: from ...error import GraphQLError
  from .base import ValidationRule
label_desc: Use image node_id 5 for calling the NoUnusedVariables obj's underlying member method code with example usage: obj.unused_variable_message(variable_name, op_name) and returns: str, str