fuel.py

"""
In a file called fuel.py, implement a program that prompts the user for a fraction, formatted as X/Y, wherein each of X and Y is an integer, and then outputs, as a percentage rounded to the nearest integer, how much fuel is in the tank. If, though, 1% or less remains, output E instead to indicate that the tank is essentially empty. And if 99% or more remains, output F instead to indicate that the tank is essentially full.

If, though, X or Y is not an integer, X is greater than Y, or Y is 0, instead prompt the user again. (It is not necessary for Y to be 4.) Be sure to catch any exceptions like ValueError or ZeroDivisionError.
"""


def get_fuel(prompt):
    while True:
        try:
            x, y = str(input(prompt)).split("/")
            x, y = int(x), int(y)
            fuel = x / y
            if fuel > 1:
                continue
        except (ValueError, ZeroDivisionError):
            pass
        else:
            return fuel


def main():
    fuel = get_fuel("Fraction: ")
    if fuel <= 0.01:
        print("E")
    elif fuel >= 0.99:
        print("F")
    else:
        print(f"{fuel:.0%}")


if __name__ == "__main__":
    main()