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MAX_SPEED = 80

def validate_speed(user_speed, max_speed_street=MAX_SPEED):
    diff = user_speed - max_speed_street
    
    if diff <= 0:
        print("Não houve multa")
    elif diff <= 10:
        print("Levou multa leve!")
    elif diff <= 20:
        print("Levou multa grave")
    elif diff > 20:
        print("Levou multa gravissíma")

speed_user = ''    
while True:    
    print("Digite um número inteiro!")
    speed_user = input('Digite a velocidade atual: ')
    if speed_user.isnumeric():
        speed_user = int(speed_user)
        break
    print('')
validate_speed(speed_user)