Python File handling: Seaching for specific numbers

Question

I'm creating a document in which I need to record license plates of vehicles (it's a practice exercise, nothing illegal) and calculate the speed they travel at and display all the vehicles that are travelling over 60 miles per hour. I'm pretty new to file handling and have no idea how to get Python to search for specific numbers. Help!

Code so far:

plate = "blank"
sensor1 = "blank"
sensor2 = "blank"
timetaken = "blank"
speed = "blank"

plate = input("Please input the license plate of the vehicle.")

sensor1 = float(input("Input the time the vehicle passed sensor 1."))
sensor2 = float(input("Input the time the vehicle passed sensor 2."))

timetaken = (sensor2 - sensor1)

print("The time taken for the vehicle to travel between the two sensors in  seconds:")
print(timetaken)

speed = (5/timetaken)
print("Vehicle speed in miles per hour:")
print(speed)

Edit: I appreciate the help but I'm not sure how I can search the .txt document that will be created later on to search for a specific license plate.

Answer 1

if (speed>60)
    #Do what you want to