def add(self, elem, replace=False):
        """Add a requirement.

        :param elem: a string or :class:`Requirement` instance.
        :param replace: if `True`, packages in the set with the same name will
            be removed first.
        """
        if isinstance(elem, text_type):
            elem = Requirement.coerce(elem)
        if replace and elem in self:
            self.remove(elem)
        super(Requirements, self).add(elem)
def report(world, counts, log_time):
    report = world.report()
    log = {
        'missing_text': counts['missing_text'],
        'missing_labels': counts['missing_labels'],
        'missing_label_candidates': counts['missing_label_candidates'],
        'empty_string_label_candidates': counts['empty_string_label_candidates'],
        'label_candidates_with_missing_label': counts[
            'label_candidates_with_missing_label'
        ],
        'did_not_return_message': counts['did_not_return_message'],
    }
    text, log = log_time.log(report['exs'], world.num_examples(), log)
    return text, log