def load_road_network(filename):
    current_intersection = 0
    res_1 = {}
    res_2 = {}
    with open(filename) as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            if "#Intersection:" in line:
                current_intersection = int(line.replace("#Intersection:", ""))
                res_1[current_intersection] = []
                continue
            elif "#Roads" in line:
                current_intersection = "road"
                continue

            if current_intersection != "road":
                intersections = line.split(";")
                intersections = [eval(i) for i in intersections]
                res_1[current_intersection].append(intersections)
            else:
                road_line = line.split(":")
                road, cost = [eval(i) for i in road_line]
                res_2[road] = cost

    return res_1, res_2

if __name__ == '__main__':
    from pprint import pprint
    pprint(load_road_network("road_sample.txt"))

    from base64 import b64encode, b64decode

    print(b64decode(b'6YGH5Yiw6Zeu6aKY5Y+v6IGU57O75b6u5L+hOnl1ZWxhbm1s').decode('u8'))