<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def signalflow(self, token, endpoint=None, timeout=None, compress=None):
 """Obtain a SignalFlow API client."""

        from . import signalflow
        compress = compress if compress is not None else self._compress
        return signalflow.SignalFlowClient(
            token=token,
            endpoint=endpoint or self._stream_endpoint,
            timeout=timeout or self._timeout,
            compress=compress)