def __init__(self, filename=None):
        self._lines = []
        self._index = defaultdict(list)
        self._hashed_hosts = []
        self._wildcards = []
        self._filename = filename
        if filename is not None:
            self.load(filename)
Load known_hosts file, or create an empty dictionary
dataset/ETHPy150Open radssh/radssh/radssh/known_hosts.py/KnownHosts.__init__