done = "n"#enter the distance, used a while and try/excpet to allow people to make mistakes.
while done == "n":
    try:
        distance_miles = int(input("enter the distance between the two cameras, in miles: "))
        done = "y"
    except:
        print("it must be an integer in miles, try again")
        done = "n"
speedlimit = 70#defines the speedlimit
speeders = []#defines the list of speeders for later.
while True:#menu, allows the user to choose one of two options. option 1 being the main bit of program, option 2 allowing the user to quit.
    option = input("option 1: monitor the speed of a vehicle.\noption 2: out the list of vheicles breaking the speed limit and quit the program.\nenter number of option: ")
    if option == "1":
        try:
            car_plate = input("enter the car number plate _")
            car_point1 = input("enter the time the car passes the first camera\nusing the format HH:MM:SS _")#enters the time, and then the next lines processs it.
            time1 = car_point1.split(":")
            time1hour = int(time1[0])
            time1mins = int(time1[1])
            time1secs = int(time1[2])
            time_in_hours1 = (time1hour+(time1mins/60)+(time1secs/60)/60)
            car_point2 = input("enter the time the car passes the second camera\nusing the format HH:MM:SS _")#second time. could have used a loop or function to reduce line count, but not significanlty.
            time2 = car_point2.split(":")
            time2hour = int(time2[0])
            time2mins = int(time2[1])
            time2secs = int(time2[2])
            time_in_hours2 = (time2hour+(time2mins/60)+(time2secs/60)/60)
            timetaken = time_in_hours2 - time_in_hours1#finds the differeence between the two tines, so the time taken.
            speed = distance_miles/timetaken
            print("speed is:",speed,"mph")
            if speed > speedlimit:#evaluate if the car is speeding or not.
                print("this car is speedng")#output
                speeders.append(car_plate)
                print("The current list of speeders is:",speeders)#output of list of speeders
            else:
                print("this car is not speeding")#output
        except:
            print("you have not entered the time in the right format, try again")
    elif option == "2":
        print("The list of speeders is:",speeders)#output of list of speeders
        print("goodbye")
        break#quit
    else:
        print("that is not an option")