How to use the sumo.tools.sumolib.net.generator.network.Net function in sumo

def straight(defaultNode=None, defaultEdge=None, centralReservation=0):
    net = network.Net(defaultNode, defaultEdge)
    net.addNode(network.Node("0/1", 0, 500, "priority"))
    net.addNode(network.Node("1/1", 500, 500, "traffic_light"))
    net.addNode(network.Node("2/1", 1000, 500, "priority"))
    net.connectNodes("0/1", "1/1", True, centralReservation)
    net.connectNodes("2/1", "1/1", True, centralReservation)
    return net
#  d = demand.Demand()

def grid(numIntersectionsX=10, numIntersectionsY=5, defaultNode=None, defaultEdge=None, centralReservation=0):
    net = network.Net(defaultNode, defaultEdge)
    for x in range(0, numIntersectionsX):
        net.addNode(
            network.Node(str(x + 1) + "/0", (x + 1) * 500, 0, "priority"))
        net.addNode(network.Node(str(x + 1) + "/" + str(numIntersectionsY + 1),
                                 (x + 1) * 500, (numIntersectionsY + 1) * 500, "priority"))
    for y in range(0, numIntersectionsY):
        net.addNode(
            network.Node("0/" + str(y + 1), 0, (y + 1) * 500, "priority"))
        net.addNode(network.Node(str(numIntersectionsX + 1) + "/" +
                                 str(y + 1), (numIntersectionsX + 1) * 500, (y + 1) * 500, "priority"))
    for x in range(0, numIntersectionsX):
        for y in range(0, numIntersectionsY):
            net.addNode(network.Node(
                str(x + 1) + "/" + str(y + 1), (x + 1) * 500, (y + 1) * 500, "traffic_light"))
    for x in range(0, numIntersectionsX):
        for y in range(0, numIntersectionsY):

def cross(defaultNode=None, defaultEdge=None, centralReservation=0):
    net = network.Net(defaultNode, defaultEdge)
    net.addNode(network.Node("1/0", 500, 0, "priority"))
    net.addNode(network.Node("0/1", 0, 500, "priority"))
    net.addNode(network.Node("1/1", 500, 500, "traffic_light"))
    net.addNode(network.Node("2/1", 1000, 500, "priority"))
    net.addNode(network.Node("1/2", 500, 1000, "priority"))
    net.connectNodes("1/0", "1/1", True, centralReservation)
    net.connectNodes("0/1", "1/1", True, centralReservation)
    net.connectNodes("2/1", "1/1", True, centralReservation)
    net.connectNodes("1/2", "1/1", True, centralReservation)
    return net

def corridor(numIntersections=10, defaultNode=None, defaultEdge=None, centralReservation=0, hdistance=500):
    net = network.Net(defaultNode, defaultEdge)
    net.addNode(network.Node("0/1", 0, 500, "priority"))
    for i in range(0, numIntersections):
        net.addNode(
            network.Node(str(i + 1) + "/0", (i + 1) * hdistance, 0, "priority"))
        net.addNode(
            network.Node(str(i + 1) + "/1", (i + 1) * hdistance, 500, "traffic_light"))
        net.addNode(
            network.Node(str(i + 1) + "/2", (i + 1) * hdistance, 1000, "priority"))
        net.connectNodes(
            str(i) + "/1", str(i + 1) + "/1", True, centralReservation)
        net.connectNodes(
            str(i + 1) + "/0", str(i + 1) + "/1", True, centralReservation)
        net.connectNodes(
            str(i + 1) + "/1", str(i + 1) + "/2", True, centralReservation)
    net.addNode(network.Node(str(numIntersections + 1) + "/1",
                             (numIntersections + 1) * 500, 500, "priority"))