def rebuild_vuln_to_hosts(self):
        self.vuln_to_hosts = {}
        for host,vulns in self.host_to_vulns.iteritems():
            for vuln in vulns:
                if self.vuln_to_hosts not in vuln:
                    self.vuln_to_hosts[vuln] = set()
                self.vuln_to_hosts[vuln].add(host)
dataset/ETHPy150Open maxburkhardt/nessus-parser/util/scandata.py/ScanData.rebuild_vuln_to_hosts/swapped operands of `not in`