def getEvolutionratemessage (before , after) :
    try :
        evolution = (after - before ) / before * 100
    except ZeroDivisionError :
        return "can't divide by zero "

    if evolution > 0 :
        statement = f"A Positive evolution of {round(evolution)}%"
    elif evolution < 0:
        statement = f"A Negative evolution of {round(evolution)}%"
    else :
        statement = f"No evolution"
    return statement

print (getEvolutionratemessage(95.12 , 66.84))