python time,datetime,string转换

#把datetime转成字符串def datetime_toString(dt):    return dt.strftime("%Y-%m-%d-%H")#把字符串转成datetimedef string_toDatetime(string):    return datetime.strptime(string, "%Y-%m-%d-%H")#把字符串转成时间戳形式def string_toTimestamp(strTime):    return time.mktime(string_toDatetime(strTime).timetuple())#把时间戳转成字符串形式def timestamp_toString(stamp):    return time.strftime("%Y-%m-%d-%H", tiem.localtime(stamp))#把datetime类型转外时间戳形式def datetime_toTimestamp(dateTim):    return time.mktime(dateTim.timetuple())