关于python:python将特殊时间格式-几天前-几月前-几年前-几周前-转换为xxxxxxxx格式

import timeimport refrom datetime import datetime,timedeltacurrent_year = datetime.today().strftime("%Y")def converting_time( ori_value):    """    对工夫格局进行转换    把 xxx秒前   xxx分前   xxx小时前  xxx天前   xxx月前   xxx年前    转换为 2019-06-24 这种格局的工夫    params: ori_value    return: target_style_time    """    current_year = datetime.today().strftime("%Y")    num = int(re.findall('\d+', ori_value)[0])    if '秒' in ori_value:        s = (datetime.now() - timedelta(seconds=num))    elif '分' in ori_value:        s = (datetime.now() - timedelta(minutes=num))    elif '时' in ori_value:        s = (datetime.now() - timedelta(hours=num))    elif '天' in ori_value:        s = (datetime.now() - timedelta(days=num))    elif '月' in ori_value:        s = (datetime.now() - timedelta(days=num * 30))    elif '年' in ori_value:        s = (datetime.now() - timedelta(days=num * 365))    else:        ori_value += ',' + current_year        s = datetime.strptime(ori_value, '%m %d %Y')    temp_time = str(int(time.mktime(s.timetuple())))    now = int(temp_time)    time_array = time.localtime(now)    target_style_time = time.strftime("%Y-%m-%d", time_array)    return target_style_time    # else:    #     return Noneresult = converting_time('3月前')print(result)