How to use the sumo.tools.randomTrips.RandomEdgeGenerator function in sumo

sink_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, "_outgoing", forbidden_sink_fringe))
        if options.weightsprefix:
            if os.path.isfile(options.weightsprefix + SOURCE_SUFFIX):
                source_generator = RandomEdgeGenerator(
                    net, LoadedProps(options.weightsprefix + SOURCE_SUFFIX))
            if os.path.isfile(options.weightsprefix + SINK_SUFFIX):
                sink_generator = RandomEdgeGenerator(
                    net, LoadedProps(options.weightsprefix + SINK_SUFFIX))
    except InvalidGenerator:
        print("Error: no valid edges for generating source or destination. Try using option --allow-fringe",
              file=sys.stderr)
        return None

    try:
        via_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, None, None))
        if options.weightsprefix and os.path.isfile(options.weightsprefix + VIA_SUFFIX):
            via_generator = RandomEdgeGenerator(
                net, LoadedProps(options.weightsprefix + VIA_SUFFIX))
    except InvalidGenerator:
        if options.intermediate > 0:
            print(
                "Error: no valid edges for generating intermediate points", file=sys.stderr)
            return None
        else:
            via_generator = None

    return RandomTripGenerator(
        source_generator, sink_generator, via_generator, options.intermediate, options.pedestrians)

def buildTripGenerator(net, options):
    try:
        forbidden_source_fringe = None if options.allow_fringe else "_outgoing"
        forbidden_sink_fringe = None if options.allow_fringe else "_incoming"
        source_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, "_incoming", forbidden_source_fringe))
        sink_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, "_outgoing", forbidden_sink_fringe))
        if options.weightsprefix:
            if os.path.isfile(options.weightsprefix + SOURCE_SUFFIX):
                source_generator = RandomEdgeGenerator(
                    net, LoadedProps(options.weightsprefix + SOURCE_SUFFIX))
            if os.path.isfile(options.weightsprefix + SINK_SUFFIX):
                sink_generator = RandomEdgeGenerator(
                    net, LoadedProps(options.weightsprefix + SINK_SUFFIX))
    except InvalidGenerator:
        print("Error: no valid edges for generating source or destination. Try using option --allow-fringe",
              file=sys.stderr)
        return None

    try:

def buildTripGenerator(net, options):
    try:
        forbidden_source_fringe = None if options.allow_fringe else "_outgoing"
        forbidden_sink_fringe = None if options.allow_fringe else "_incoming"
        source_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, "_incoming", forbidden_source_fringe))
        sink_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, "_outgoing", forbidden_sink_fringe))
        if options.weightsprefix:
            if os.path.isfile(options.weightsprefix + SOURCE_SUFFIX):
                source_generator = RandomEdgeGenerator(
                    net, LoadedProps(options.weightsprefix + SOURCE_SUFFIX))
            if os.path.isfile(options.weightsprefix + SINK_SUFFIX):
                sink_generator = RandomEdgeGenerator(
                    net, LoadedProps(options.weightsprefix + SINK_SUFFIX))
    except InvalidGenerator:
        print("Error: no valid edges for generating source or destination. Try using option --allow-fringe",
              file=sys.stderr)
        return None

    try:
        via_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, None, None))
        if options.weightsprefix and os.path.isfile(options.weightsprefix + VIA_SUFFIX):
            via_generator = RandomEdgeGenerator(
                net, LoadedProps(options.weightsprefix + VIA_SUFFIX))
    except InvalidGenerator:

def buildTripGenerator(net, options):
    try:
        forbidden_source_fringe = None if options.allow_fringe else "_outgoing"
        forbidden_sink_fringe = None if options.allow_fringe else "_incoming"
        source_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, "_incoming", forbidden_source_fringe))
        sink_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, "_outgoing", forbidden_sink_fringe))
        if options.weightsprefix:
            if os.path.isfile(options.weightsprefix + SOURCE_SUFFIX):
                source_generator = RandomEdgeGenerator(
                    net, LoadedProps(options.weightsprefix + SOURCE_SUFFIX))
            if os.path.isfile(options.weightsprefix + SINK_SUFFIX):
                sink_generator = RandomEdgeGenerator(
                    net, LoadedProps(options.weightsprefix + SINK_SUFFIX))
    except InvalidGenerator:
        print("Error: no valid edges for generating source or destination. Try using option --allow-fringe",
              file=sys.stderr)
        return None

    try:
        via_generator = RandomEdgeGenerator(
            net, get_prob_fun(options, None, None))
        if options.weightsprefix and os.path.isfile(options.weightsprefix + VIA_SUFFIX):
            via_generator = RandomEdgeGenerator(
                net, LoadedProps(options.weightsprefix + VIA_SUFFIX))
    except InvalidGenerator:
        if options.intermediate > 0:
            print(
                "Error: no valid edges for generating intermediate points", file=sys.stderr)