book_4.14_ex07.py

value = input("Enter a score: ")

def computegrade(value):
    try:
        score = float(value)
        if score > 0 and score < 1.0:
            if score >= 0.9:
                print("A")
            elif score >= 0.8:
                print("B")
            elif score >= 0.7:
                print("C")
            elif score >= 0.6:
                print("D")
            else:
                print("F")
        else: print("Bad score")
    except:
        print("Bad score")
    return print()
print(computegrade(value))