grade.py

def main():
    while True:
        try:
            grade = int(input('Enter grade: '))
        except:
            print('Invalid grade')
        else:
            break
    result = getDadComment(grade)
    print(result)


def getDadComment(g):
    if g>=90:
        feedback = 'Keep it up, sonny boy'
    elif g>=80:
        feedback = 'No desert'
    elif g>=70:
        feedback = 'more chores incoming'
    elif g>=65:
        feedback = 'sleep in the barn, sonny boy'
    else:
        feedback = 'no supper for you'

    return feedback

main()