def requestIdentities(self):
        """
        @return: A L{Deferred} which will fire with a list of all keys found in
            the SSH agent. The list of keys is comprised of (public key blob,
            comment) tuples.
        """
        d = self.sendRequest(AGENTC_REQUEST_IDENTITIES, b'')
        d.addCallback(self._cbRequestIdentities)
        return d

        @return: A L{Deferred} which will fire with a list of all keys found in
            the SSH agent. The list of keys is comprised of (public key blob,
            comment) tuples.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/ssh/agent.py