def mutate(self, obj):
    sigma = 0.05
    return ((obj[0] * random.gauss(1, sigma)), (obj[1] * random.gauss(1, sigma)))
def mutate(self, obj):
    sigma = 0.05
    return ((obj[0] * random.gauss(1, sigma)), (obj[1] * random.gauss(1, sigma)))