def add(self, elem, replace=False):
        """Add a requirement.

        :param elem: a string or :class:`Requirement` instance.
        :param replace: if `True`, packages in the set with the same name will
            be removed first.
        """
        if isinstance(elem, text_type):
            elem = Requirement.coerce(elem)
        if replace and elem in self:
            self.remove(elem)
        super(Requirements, self).add(elem)
def connectWithSsh(self):
        self._debugLog("Establishing connection to " + self.host)
        self._connection = self.pexpect.spawn(
                'ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no %s@%s -p %d' % 
                (self._loginUser.username, self.host, self._port))
        if self._connection is None:
            raise Exception("Unable to connect via SSH perhaps wrong IP!")
        self._secure = True
        self._setupLog()
        self._loginUser.commandLine(self)
        self.modeList = [self._loginUser]