Python 中 xrange 生成的最后个项怎么判断。 - V2EX
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csdreamdong
V2EX    Python

Python 中 xrange 生成的最后个项怎么判断。

  •  
  •   csdreamdong 2017-07-17 16:10:40 +08:00 2753 次点击
    这是一个创建于 3058 天前的主题,其中的信息可能已经有所发展或是发生改变。
    start_time = '2017-01-01 00:00:00' end_time = '2017-07-01 00:00:00' start_time_st = int(time.mktime(time.strptime(start_time, '%Y-%m-%d %H:%M:%S'))) end_time_st = int(time.mktime(time.strptime(end_time, '%Y-%m-%d %H:%M:%S'))) for stmp in xrange(start_time_st, end_time_st, 60): ...... 需要生成一个 list, if len(list)>=100 or stmp 是最后一个时: do..... 

    这个场景下,怎么判断 stmp 已经是最后一个了。求助大神们。

    11 条回复    2017-07-18 08:46:20 +08:00
    csdreamdong
        1
    csdreamdong  
    OP
       2017-07-17 16:11:35 +08:00
    python2.7
    sleshep
        2
    sleshep  
       2017-07-17 16:13:12 +08:00
    用 arrow 库啊,你这么折腾时间不难受啊
    sleshep
        3
    sleshep  
       2017-07-17 16:14:33 +08:00
    import arrow
    arrow.get(2017).span('month')[:7]


    2 行搞定的事情
    csdreamdong
        4
    csdreamdong  
    OP
       2017-07-17 16:15:11 +08:00
    @sleshep 我想指定一段时间,每隔 60 秒一个时间戳。要这段时间内的所有时间戳。
    sleshep
        5
    sleshep  
       2017-07-17 16:20:47 +08:00
    >>> from datetime import datetime
    >>> import arrow
    >>> start = datetime(2013, 5, 5, 12, 30)
    >>> end = datetime(2013, 5, 5, 17, 15)
    >>> for r in arrow.Arrow.range('hour', start, end):
    ... print repr(r)
    ...
    <Arrow [2013-05-05T12:30:00+00:00]>
    <Arrow [2013-05-05T13:30:00+00:00]>
    <Arrow [2013-05-05T14:30:00+00:00]>
    <Arrow [2013-05-05T15:30:00+00:00]>
    <Arrow [2013-05-05T16:30:00+00:00]>
    csdreamdong
        6
    csdreamdong  
    OP
       2017-07-17 16:27:44 +08:00
    @sleshep 但怎么判断是不是最后个呢?
    rogerchen
        7
    rogerchen  
       2017-07-17 16:58:34 +08:00
    for i, stmp in enumerate(xrange(...))
    KingMaster
        8
    KingMaster  
       2017-07-17 17:13:51 +08:00
    if stmp + 60 >= end_time_st:
    ...
    KgM4gLtF0shViDH3
        9
    KgM4gLtF0shViDH3  
       2017-07-17 17:27:46 +08:00
    @rogerchen 这还不如直接用 range。。。
    crab
        10
    crab  
       2017-07-17 17:46:44 +08:00
    用 unix 时间,再转回去。
    zjuhwc
        11
    zjuhwc  
       2017-07-18 08:46:20 +08:00 via iPhone
    把是不是最后一个的判断挪到循环外面去?
    因为 for 循环结束后,stmp 就停在最后一个值上了,循环外做一次 do 操作
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