Python判断字符串是否符合时间格式

strdate = “2020-1-2 12:1:1”
b = re.findall(":", strdate)
try:
    if len(b) >= 2:
        time.strptime(strdate, "%Y-%m-%d %H:%M:%S")
        # time.strptime(check_date[ck_field], "Y年%m-%d %H:%M:%S")
    elif 0 < len(b) < 2:
        time.strptime(strdate, "%Y-%m-%d %H:%M")
    else:
        time.strptime(strdate, "%Y-%m-%d")

except Exception as e:
    logger.error(
        "字段：{0}>>>>>>>对应值{1}：不是时间格式".format(
            check_date[ck_field],
            check_date))