10.11 LAB: Step counter - exceptions

Question

A pedometer treats walking 2,000 steps as walking 1 mile. Write a steps_to_miles() function that takes the number of steps as a parameter and returns the miles walked. The steps_to_miles() function throws a ValueError object with the message "Exception: Negative step count entered." when the number of steps is negative. Complete the main() program that reads the number of steps from a user, calls the steps_to_miles() function, and outputs the returned value from the steps_to_miles() function. Use a try-except block to catch any ValueError object thrown by the steps_to_miles() function and output the exception message.

Output each floating-point value with two digits after the decimal point, which can be achieved as follows:

print(f'{your_value:.2f}')

Ex: If the input of the program is:

5345

the output of the program is:

2.67

Answer 1

def steps_to_miles(steps):

if steps < 0:

raise ValueError("Exception: Negative step count entered.")

else:

miles = steps / 2000

return miles

def main():

try:

steps = int(input())

miles = steps_to_miles(steps)

print(f'{miles:.2f}')

except ValueError as e:

print(e)

if __name__ == '__main__':

main()

The steps_to_miles() function takes a parameter steps and checks whether it's negative or not. If it's negative, it raises a ValueError with the specified message. If it's positive or zero, it calculates the equivalent miles walked and returns it.

The main() program reads the number of steps from the user and calls the steps_to_miles() function with it. If the function raises a ValueError, the program catches it using a try-except block and prints the exception message. Otherwise, it prints the miles walked with two digits after the decimal point using formatted string literals.

Hope this helps!