Format timedelta to string

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春和景丽
春和景丽 2020-11-22 03:57

I\'m having trouble formatting a datetime.timedelta object.

Here\'s what I\'m trying to do: I have a list of objects and one of the members of the cl

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  • 2020-11-22 04:23

    I would seriously consider the Occam's Razor approach here:

    td = str(timedelta).split('.')[0]
    

    This returns a string without the microseconds

    If you want to regenerate the datetime.timedelta object, just do this:

    h,m,s = re.split(':', td)
    new_delta = datetime.timedelta(hours=int(h),minutes=int(m),seconds=int(s))
    

    2 years in, I love this language!

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  • 2020-11-22 04:23

    timedelta to string, use for print running time info.

    def strf_runningtime(tdelta, round_period='second'):
      """timedelta to string,  use for measure running time
      attend period from days downto smaller period, round to minimum period
      omit zero value period  
      """
      period_names = ('day', 'hour', 'minute', 'second', 'millisecond')
      if round_period not in period_names:
        raise Exception(f'round_period "{round_period}" invalid, should be one of {",".join(period_names)}')
      period_seconds = (86400, 3600, 60, 1, 1/pow(10,3))
      period_desc = ('days', 'hours', 'mins', 'secs', 'msecs')
      round_i = period_names.index(round_period)
      
      s = ''
      remainder = tdelta.total_seconds()
      for i in range(len(period_names)):
        q, remainder = divmod(remainder, period_seconds[i])
        if int(q)>0:
          if not len(s)==0:
            s += ' '
          s += f'{q:.0f} {period_desc[i]}'
        if i==round_i:
          break
        if i==round_i+1:
          s += f'{remainder} {period_desc[round_i]}'
          break
        
      return s
    

    e.g. auto omit zero leading period:

    >>> td = timedelta(days=0, hours=2, minutes=5, seconds=8, microseconds=3549)
    >>> strfdelta_round(td, 'second')
    '2 hours 5 mins 8 secs'
    

    or omit middle zero period:

    >>> td = timedelta(days=2, hours=0, minutes=5, seconds=8, microseconds=3549)
    >>> strfdelta_round(td, 'millisecond')
    '2 days 5 mins 8 secs 3 msecs'
    

    or round to minutes, omit below minutes:

    >>> td = timedelta(days=1, hours=2, minutes=5, seconds=8, microseconds=3549)
    >>> strfdelta_round(td, 'minute')
    '1 days 2 hours 5 mins'
    
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  • 2020-11-22 04:24

    He already has a timedelta object so why not use its built-in method total_seconds() to convert it to seconds, then use divmod() to get hours and minutes?

    hours, remainder = divmod(myTimeDelta.total_seconds(), 3600)
    minutes, seconds = divmod(remainder, 60)
    
    # Formatted only for hours and minutes as requested
    print '%s:%s' % (hours, minutes)
    

    This works regardless if the time delta has even days or years.

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  • 2020-11-22 04:25

    As you know, you can get the total_seconds from a timedelta object by accessing the .seconds attribute.

    Python provides the builtin function divmod() which allows for:

    s = 13420
    hours, remainder = divmod(s, 3600)
    minutes, seconds = divmod(remainder, 60)
    print '{:02}:{:02}:{:02}'.format(int(hours), int(minutes), int(seconds))
    # result: 03:43:40
    

    or you can convert to hours and remainder by using a combination of modulo and subtraction:

    # arbitrary number of seconds
    s = 13420
    # hours
    hours = s // 3600 
    # remaining seconds
    s = s - (hours * 3600)
    # minutes
    minutes = s // 60
    # remaining seconds
    seconds = s - (minutes * 60)
    # total time
    print '{:02}:{:02}:{:02}'.format(int(hours), int(minutes), int(seconds))
    # result: 03:43:40
    
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  • 2020-11-22 04:26

    You can just convert the timedelta to a string with str(). Here's an example:

    import datetime
    start = datetime.datetime(2009,2,10,14,00)
    end   = datetime.datetime(2009,2,10,16,00)
    delta = end-start
    print(str(delta))
    # prints 2:00:00
    
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  • 2020-11-22 04:26

    My datetime.timedelta objects went greater than a day. So here is a further problem. All the discussion above assumes less than a day. A timedelta is actually a tuple of days, seconds and microseconds. The above discussion should use td.seconds as joe did, but if you have days it is NOT included in the seconds value.

    I am getting a span of time between 2 datetimes and printing days and hours.

    span = currentdt - previousdt
    print '%d,%d\n' % (span.days,span.seconds/3600)
    
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