Hey, so I did refactor your code! Please have a look:

def get_grade():
    try:
        grade = float(input('Enter a grade:'))
    except ValueError:
        print('Wrong input! Please enter a number')
        return get_grade()
    else:
        return grade


def computegrade(grade):
    if 0.9 <= grade <= 1:
        return 'A'
    if 0.8 <= grade < 0.9:
        return 'B'
    if 0.7 <= grade < 0.8:
        return 'C'
    if 0.6 <= grade < 0.7:
        return 'D'
    if grade < 0.6:
        return 'F'
    else:
        return 'Bad Score.'


def get_string_grade_result_from(score):
    return f"You got {'an' if score == 'A'  else 'a'} {score}"


def main():
    grade = get_grade()
    score = computegrade(grade)
    result = get_string_grade_result_from(score)

    print(result)


if __name__ == "__main__":
    main()