def find1(self, kw: YangIdentifier, arg: str = None,
              pref: YangIdentifier = None,
              required: bool = False) -> Optional["Statement"]:
        """Return first substatement with the given parameters.

        Args:
            kw: Statement keyword (local part for extensions).
            arg: Argument (all arguments will match if ``None``).
            pref: Keyword prefix (``None`` for built-in statements).
            required: Should an exception be raised on failure?

        Raises:
            StatementNotFound: If `required` is ``True`` and the
                statement is not found.
        """
        for sub in self.substatements:
            if (sub.keyword == kw and sub.prefix == pref and
                    (arg is None or sub.argument == arg)):
                return sub
        if required:
            raise StatementNotFound(str(self), kw)
def find1 ( self , kw : YangIdentifier , arg : str = None , pref : YangIdentifier = None , required : bool = False ) -> Optional [ "Statement" ] : for sub in self . substatements : if ( sub . keyword == kw and sub . prefix == pref and ( arg is None or sub . argument == arg ) ) : return sub if required : raise StatementNotFound ( str ( self ) , kw )
Return first substatement with the given parameters.

        Args:
            kw: Statement keyword (local part for extensions).
            arg: Argument (all arguments will match if ``None``).
            pref: Keyword prefix (``None`` for built-in statements).
            required: Should an exception be raised on failure?

        Raises:
            StatementNotFound: If `required` is ``True`` and the
                statement is not found.