python常用方法----获取当前、分、时、日、月、年时间戳，当前时间前后，分、时、日、月、年开始、结束毫秒时间戳

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菜鸡的我，在写脚本的过程中发现要不断获取时间戳，且是不同时间段的，经过一番查阅完善有了下面的方法，大佬勿喷！
def getTime(time_type,LG):
    '''
    获取年，月，日，时，分前后的具体时间及开始和结束时间
    :param time_type: 1:天；2：小时；3：分钟；4：月，5：年
    :param LG: 整数值 0当前，1往后1分钟，小时，天，月，年，-1往前一分钟，小时，天，月，年。
    :return: start_time：开始时间、end_time：结束时间、present_date：当前时间
    '''
    Date = datetime.datetime.now()
    dates = None
    start_time = None
    end_time = None
    present_time = None
    if time_type <= 3:
        if time_type == 1:
            dates = datetime.timedelta(days=LG*-1)
        elif time_type == 2:
            dates = datetime.timedelta(hours=LG*-1)
        elif time_type == 3:
            dates = datetime.timedelta(minutes=LG*-1)
        strtime = Date - dates
        present = strtime.strftime('%Y-%m-%d %H:%M:%S')
        present_date = time.strptime(present, "%Y-%m-%d %H:%M:%S")
        present_time = int(time.mktime(present_date) * 1000)
        if time_type == 1:
            start = '{} 00:00:00'.format(present[0:-9])
            start = time.strptime(start, "%Y-%m-%d %H:%M:%S")
            start_time = int(time.mktime(start) * 1000)
            end = '{} 23:59:59'.format(present[0:-9])
            end = time.strptime(end, "%Y-%m-%d %H:%M:%S")
            end_time = int(time.mktime(end) * 1000)
        elif time_type == 2:
            start = '{}:00:00'.format(present[0:-6])
            start = time.strptime(start, "%Y-%m-%d %H:%M:%S")
            start_time = int(time.mktime(start) * 1000)
            end = '{}:59:59'.format(present[0:-6])
            end = time.strptime(end, "%Y-%m-%d %H:%M:%S")
            end_time = int(time.mktime(end) * 1000)
        elif time_type == 3:
            start = '{}:00'.format(present[0:-3])
            start = time.strptime(start, "%Y-%m-%d %H:%M:%S")
            start_time = int(time.mktime(start) * 1000)
            end =  '{}:59'.format(present[0:-3])
            end = time.strptime(end, "%Y-%m-%d %H:%M:%S")
            end_time = int(time.mktime(end) * 1000)
    else:
        YTD = arrow.now()
        if time_type == 4:
            data_time = YTD.shift(months=+LG).format("YYYY-MM-DD")
            data_times = YTD.shift(months=+LG).format("YYYY-MM-DD HH:mm:ss")
            year = data_time[0:-5]
            mouth = data_time[5:-3]
            if int(data_time[5:-3]) in (1, 3, 5, 7, 8, 10, 12):
                start = '{}{}-01 00:00:00'.format(year,mouth)
                start = time.strptime(start, "%Y-%m-%d %H:%M:%S")
                start_time = int(time.mktime(start) * 1000)
                end = '{0}{1}-31 23:59:59'.format(year,mouth)
                end = time.strptime(end, "%Y-%m-%d %H:%M:%S")
                end_time = int(time.mktime(end) * 1000)
                present_date = time.strptime(data_times, "%Y-%m-%d %H:%M:%S")
                present_time = int(time.mktime(present_date) * 1000)
            elif int(data_time[5:-3]) == int('02'):
                start = '{0}{1}-01 00:00:00'.format(year,mouth)
                start = time.strptime(start, "%Y-%m-%d %H:%M:%S")
                start_time = int(time.mktime(start) * 1000)
                end = '{0}{1}-28 23:59:59'.format(year,mouth)
                end = time.strptime(end, "%Y-%m-%d %H:%M:%S")
                end_time = int(time.mktime(end) * 1000)
                present_date = time.strptime(data_times, "%Y-%m-%d %H:%M:%S")
                present_time = int(time.mktime(present_date) * 1000)

            else:
                start = '{0}{1}-01 00:00:00'.format(year,mouth)
                start = time.strptime(start, "%Y-%m-%d %H:%M:%S")
                start_time = int(time.mktime(start) * 1000)
                end = '{0}{1}-30 23:59:59'.format(year,mouth)
                end = time.strptime(end, "%Y-%m-%d %H:%M:%S")
                end_time = int(time.mktime(end) * 1000)
                present_date = time.strptime(data_times, "%Y-%m-%d %H:%M:%S")
                present_time = int(time.mktime(present_date) * 1000)
        elif time_type == 5:
            data_time = str(int(datetime.datetime.now().strftime("%Y"))+LG)+"-"+datetime.datetime.now().strftime("%m-%d")
            data_times = str(int(datetime.datetime.now().strftime("%Y")) + LG) + "-" + datetime.datetime.now().strftime("%m-%d %H:%M:%S")
            year = data_time[0:-6]
            start = '{}-01-01 00:00:00'.format(year)
            start = time.strptime(start,"%Y-%m-%d %H:%M:%S")
            start_time = int(time.mktime(start)*1000)
            end = '{}-12-31 23:59:59'.format(year)
            end = time.strptime(end, "%Y-%m-%d %H:%M:%S")
            end_time = int(time.mktime(end)*1000)
            present_date = time.strptime(data_times, "%Y-%m-%d %H:%M:%S")
            present_time = int(time.mktime(present_date) * 1000)
    return  start_time,end_time,present_time

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