Python Programming

Question

Design a program that calculates and displays the number of miles per hour over the speed limit that a speeding driver was doing. The program should ask for the speed limit and the driver’s speed. Validate the input as follows:

1. The speed limit should be at least 20, but not greater than 70.
2. The driver’s speed should be at least the value entered for the speed limit ­(otherwise the driver was not speeding).

Answer 1

For both the speed limit and the driver's speed, you can validate Python's input() function with a try-except blocks, wrapped in a while loop. The while loops allow for the program to "re-ask" the user for the valid input, such as in the first question of the speed limit to make sure it is within the range of 20 and 70 (combined with an if statement).

while True:

try:

spd_limit = int(input("What is the speed limit? "))

except ValueError:

print("Please enter valid integer number.")

continue

else:

if spd_limit >= 20 and spd_limit <= 70:

break

else:

print("Please enter speed limit between 20 and 70.")

continue

while True:

try:

driver_spd = int(input("What is the driver's speed? "))

except ValueError:

print("Please enter valid integer number.")

continue

else:

if driver_spd < spd_limit:

print("Driver was below the speed limit.")

continue

else:

over_limit = driver_spd - spd_limit

print(over_limit)

break

This is intended to run as a script, but this can be modified as a function, with one adjustment being to return the over_limit variable.