def _parse_tokens(self, tokens, i, actions=True):
    results = []
    try:
        (results, i) = self.expr.parse(tokens, i, actions)
    except (ParseException, IndexError):
        pass
    return (results, i)
def _parse_tokens(self, tokens, i, actions=True):
    results = []
    try:
        (results, i) = self.expr.parse(tokens, i, actions)
    except (ParseException, IndexError):
        pass
    return (results, i)