def rebuild_host_to_vulns(self):
        self.host_to_vulns = {}
        for vuln,hosts in self.vuln_to_hosts.iteritems():
            for host in hosts:
                if self.host_to_vulns not in host:
                    self.host_to_vulns[host] = set()
                self.host_to_vulns[host].add(vuln)

    # throw away the current vuln_to_hosts dictionary and rebuild it from host_to_vulns
dataset/ETHPy150Open maxburkhardt/nessus-parser/util/scandata.py/ScanData.rebuild_host_to_vulns/swapped operands of `not in`