如何检查当前时间是否在python的范围内?

问题描述

我需要检查当前时间是否在时间范围内.最简单的情况time_end > time_start:

I need to check if the current time is in timerange. The most simple case time_end > time_start:

if time(6,0) <= now.time() <= time(12,00): print '1'

但是当用户进入结束时间小于开始时间的时间范围时，麻烦就开始了，例如23:00 - 06:00".像00:00"这样的时间将在此范围内.大约 5 年前，我编写了这个 PHP 函数:

But troubles begin when user enters a time range when the end time is smaller than the start time, e.g. "23:00 - 06:00". A time like '00:00' will be in this range. About 5 years ago I wrote this PHP function:

function checkInterval($start, $end)
  {    
    $dt = date("H:i:s");    

    $tstart = explode(":", $start);
    $tend =   explode(":", $end);
    $tnow =   explode(":", $dt);

    if (!$tstart[2])
      $tstart[2] = 0;

    if (!$tend[2])
      $tend[2] = 0;  

    $tstart = $tstart[0]*60*60 + $tstart[1]*60 + $tstart[2];
    $tend   = $tend[0]*60*60   + $tend[1]*60   + $tend[2];
    $tnow   = $tnow[0]*60*60   + $tnow[1]*60   + $tnow[2];

    if ($tend < $tstart)
      {
        if ($tend - $tnow > 0 && $tnow > $tstart)
          return true;
        else if ($tnow - $tstart > 0 && $tnow > $tend)
          return true;
        else if ($tend > $tnow && $tend < $tstart && $tstart > $tnow)
          return true;
        else return false;
      } else
      {
        if ($tstart < $tnow && $tend > $tnow)
          return true;
        else
          return false;
      }

现在我需要做同样的事情，但我想让它看起来更好看.那么，我应该使用什么算法来确定当前时间 '00:00' 是否在 reversed 范围内，例如['23:00', '01:00']?

Now I need to do the same thing, but I want to make it good looking. So, what algorithm should I use to determine if the current time '00:00' is in reversed range e.g. ['23:00', '01:00']?

推荐答案

Python 解决方案将会非常非常短.

The Python solution is going to be much, much shorter.

def time_in_range(start, end, x):
    """Return true if x is in the range [start, end]"""
    if start <= end:
        return start <= x <= end
    else:
        return start <= x or x <= end

对 start、end 和 x 使用 datetime.time 类.

Use the datetime.time class for start, end, and x.

>>> import datetime
>>> start = datetime.time(23, 0, 0)
>>> end = datetime.time(1, 0, 0)
>>> time_in_range(start, end, datetime.time(23, 30, 0))
True
>>> time_in_range(start, end, datetime.time(12, 30, 0))
False

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