python 计时时间格式化

import time

start = 1602319215
t1 = int(time.time())
n = t1-start

def format_time(n,time_format="{0}天{1}小时{2}分{3}秒"):
    day_num = int(n / 86400)
    t1 = n % 86400
    hour_num = int(t1 / 3600)
    t2 = t1 % 3600
    minute_num = int(t2 / 60)
    minute_num = str(minute_num+100)[1:]
    second_num = t2 % 60
    second_num = str(second_num + 100)[1:]
    return time_format.format(day_num,hour_num,minute_num,second_num)

print(format_time(3602))