python常用时间换算

import time

#字符串转化为时间戳
def str_to_timeStamp(str):
    '''字符串格式为：2017-11-24 17:30:00'''
    timeStruct = time.strptime(str, "%Y-%m-%d %H:%M:%S")
    timeStamp = int(time.mktime(timeStruct))
    return timeStamp

#当前时间转化为字符串
def now():
    # 获得当前时间时间戳
    now = int(time.time())
    # 转换为其他日期格式,如:"%Y-%m-%d %H:%M:%S"
    timeStruct = time.localtime(now)
    strTime = time.strftime("%Y-%m-%d %H:%M:%S", timeStruct)
    return strTime