code: def find(**criteria):
      
      # Find all parts that match the given criteria
      results = search(**criteria)
  
      # error cases
      if len(results) > 1:
          raise SearchMultipleFoundError("%i results found" % len(results))
      elif not results:
          raise SearchNoneFoundError("%i results found" % len(results))
  
      # return found Part|Assembly class
      return results.pop()
docs: Find a single *component* class with the given criteria.
  
      Finds classes indexed with :meth:`register`
  
      :raises SearchMultipleFoundError: if more than one result found
      :raises SearchNoneFoundError: if nothing found
  
      ::
  
          from cqparts.search import find
          import cqparts_motors  # example of a 3rd party lib
  
          # get a specific motor class
          motor_class = find(type='motor', part_number='ABC123X')
          motor = motor_class(shaft_diameter=6.0)