def _normalise_repo_groups(self, option):
        """Resolve inherited memberships"""

        data = self.repo_groups
        tainted = data.keys()
        round_ = 0
        while tainted:
            round_ += 1
            logging.debug('Normalise {0}: round {1}'.format(option, round_))

            did_work = False

            for item in tainted:
                try:
                    members = data[item][option]
                except __HOLE__:
                    logging.debug('Removed empty item {0}'.format(item))
                    tainted.remove(item)
                    did_work = True
                    continue

                unresolved = [x for x in members if x.startswith('@')]
                if len(unresolved) == 0:
                    logging.debug('Nothing to resolve in {0}'.format(item))
                    tainted.remove(item)
                    did_work = True
                    continue

                resolved = []
                dirty = False
                for member in unresolved:
                    mem = member.lstrip('@')
                    try:
                        new_members = data[mem][option]
                    except KeyError:
                        raise UnknownDependencyException(member)
                    for new_mem in new_members:
                        if new_mem.startswith('@'):
                            # Unresolved membership in upstream group
                            dirty = True
                            break
                    resolved += new_members

                if not dirty:
                    # No dependencies remain - replace resolved groups
                    for member in unresolved:
                        members.remove(member)
                    members += resolved
                    data[item][option] = members
                    did_work = True

            if did_work is False:
                raise CyclicalDependencyException(','.join(tainted))
        self.repo_groups = data
dataset/ETHPy150Open aelse/cpthook/cpthook.py/CptHookConfig._normalise_repo_groups