def __init__(self, lhs, rhs):
self.lhs = lhs<EOL>self.rhs = rhs<EOL>self.serializers = dict(<EOL>json=CampaignMerge.SERIALIZER_CLASS(<EOL>reader=CampaignMerge._reader_json, writer=CampaignMerge._writer_json<EOL>),<EOL>yaml=CampaignMerge.SERIALIZER_CLASS(<EOL>reader=CampaignMerge._reader_yaml, writer=CampaignMerge._writer_yaml<EOL>),<EOL>)<EOL>
Merge 2 campaign directories

        :param lhs: path to campaign that will receive data
        of the second campaign
        :param rhs: campaign to merge data from