python 几分钟前，几小时前，几天前转为时间戳

一开始我是这么做的

import time
import datetime

def conv_time(t):
    min = re.findall('\d+', t)[0]
    if u'分钟' in t:
        c = time.time() - int(min) * 60

    elif u'小时' in t:
        c = time.time() - int(min)*60*60

    elif u'天' in t:
        c = time.time() - int(min)*60*60*24
    else:
        return None
    c = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(c))
    c = datetime.datetime.strptime(c, "%Y-%m-%d %H:%M:%S")
    return str(int(time.mktime(c.timetuple()))) + ""

后面看到了datetime的timedelta, 所以代码改成了这样

from datetime import datetime, timedelta

current_year = datetime.today().strftime("%Y")

def conv_time(t):
    min = int(re.findall('\d+', t)[0])
    if u'秒' in t:
        s = (datetime.now() - timedelta(seconds=min))
    elif u'分钟' in t:
        s = (datetime.now() - timedelta(minutes=min))

    elif u'小时' in t:
        s = (datetime.now() - timedelta(hours=min))

    elif u'天' in t:
        s = (datetime.now() - timedelta(days=min))
    else:
        t += ", " + current_year
        s = datetime.strptime(t, "%m-%d, %Y")
    return str(int(time.mktime(s.timetuple()))) + ""