def int_formatter(_list):
    return (('%0' + str(max(2, (math.floor(math.log((len(_list) + 0.01), 10)) + 1)))) + 'd_')
def int_formatter(_list):
    return (('%0' + str(max(2, (math.floor(math.log((len(_list) + 0.01), 10)) + 1)))) + 'd_')