def get_campaign(self, sheet_name, range_info):
        """returns the list of list of campaigns."""
        campaign_range = range_info["campaigns"].split(":")
        campaign_value_range = self._get_numeric_range(
            range_info, campaign_range[0], campaign_range[1]
        )
        campaign_value_range = "!".join([sheet_name, campaign_value_range])
        _ = self.api.values.GET(campaign_value_range).json()
        campaign_names = _["values"]
        r_names = []
        for i, campaigns in enumerate(campaign_names):
            while "" in campaigns:
                campaigns.remove("")
            campaigns = list(set(campaigns))
            r_names.append(campaigns)
        return r_names
returns the list of list of campaigns.
contrib/feeds/threattracking/threattracking.py