def coerce(cls, string):
        """Create a :class:`Requirement` object from a given package spec."""
        match = re.match(cls.spec_regex, string)
        if not match:
            raise InvalidRequirementSpecError("could not parse requirement")
        package = match.group(1)
        if all(match.group(2, 3)):
            version = "".join(match.group(2, 3))
        else:
            version = None
        return cls(package, version)
def __init__(self, host, loginUser, debug = False, trace = False, log=None, port=22, pexpectObject=None):
        self.pexpect = pexpect if not pexpectObject else pexpectObject
        self.debug = debug
        self.trace = trace
        self.host = host
        self._port = port
        self._connection = None
        self.modeList = []
        self._log = log
        self._bufferedCommands = None
        self._bufferedMode = None
        self._loginUser = loginUser
        self._resetExpect()