code: def b(field: str, kwargs: Dict[str, Any],
        present: Optional[Any] = None, missing: Any = '') -> str:
      
      if kwargs.get(field):
          return field if present is None else str(present)
      return str(missing)
docs: Return `present` value (default to `field`) if `field` in `kwargs` and
      Truthy, otherwise return `missing` value