[Tutor] Accuracy of time.sleep()

[Jacob S.]

You know, since time.sleep() builds up errors, this is what I do to keep it
purely pythonic... (not tested)

from time import gmtime

alarmhr = 8
alarmmin = 5
alarmsec = 0

while 1:
    t = gmtime()
    hour = t[3]
    min = t[4]
    sec = t[5]
    if (alarmhr,alarmmin,alarmsec) == (hour,min,sec):
        print "It is 8:05 AM. Please do whatever you are supposed to at this
time.
        raw_input()
        break

> OK I may be pushing it,  ;-)
>
> I need a script to sleep from any point to 8:05AM when in needs to
> re-start.
>
> So I calculate the number of seconds with the following ....
>
>
>
>
> def secs_till_805():
>     # Returns the number of seconds till 8:05AM
>
>     secs_5min=5*60
>     secs_24hr=24*60*60
>     secs_8hr=(8*60*60)+secs_5min
>     secs_8hr_24hr=secs_24hr-secs_8hr
>
>     hours=int(strftime('%H'))
>     mins=int(strftime('%M'))
>     secs=int(strftime('%S'))
>
>     sec_left=secs_24hr-((hours*60*60)+(mins*60)+secs)
>
>     # If we are before 8:05, then ...
>     if sec_left>secs_8hr_24hr:
>         return sec_left-secs_8hr_24hr
>
>     # If we are after 8:05, then ...
>     return sec_left+secs_8hr
>
>
>
> Then I ...
>
> sleep(secs_till_805())
>
> I expected the script to re-start 2-3 seconds after 8:05, python
> reloading after a long sleep etc, what I get is the script restarting at
> 08:04.55, earlier ???
>
> OK this is not a world stopping problem, more of a curiosity.
>
> Any suggestions
>
> Dave
>
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