How to use the basictracer.recorder.DefaultSampler function in basictracer

Note that the returned BasicTracer has *no* propagators registered. The
        user should either call register_propagator() for each needed
        inject/extract format and/or the user can simply call
        register_required_propagators().

        The required formats are opt-in because of protobuf version conflicts
        with the binary carrier.
        """

        scope_manager = ThreadLocalScopeManager() \
            if scope_manager is None else scope_manager
        super(BasicTracer, self).__init__(scope_manager)

        self.recorder = NoopRecorder() if recorder is None else recorder
        self.sampler = DefaultSampler(1) if sampler is None else sampler
        self._propagators = {}