function to convert degree (hour), minute, seconds string to integer

[John McMonagle]

On Wed, 2006-07-26 at 20:18 -0700, John Machin wrote:
> google0 at lazytwinacres.net wrote:
> > I know this is a trivial function, and I've now spent more time
> > searching for a surely-already-reinvented wheel than it would take to
> > reinvent it again, but just in case... is there a published,
> > open-source, function out there that takes a string in the form of
> > "hh:mm:ss" (where hh is 00-23, mm is 00-59, and ss is 00-59) and
> > converts it to an integer (ss + 60 * (mm + 60 * hh))?  I'd like
> > something that throws an exception if hh, mm, or ss is out of range, or
> > perhaps does something "reasonable" (like convert "01:99" to 159).
> > Thanks,
> >     --dang
> > p.s.
> > In case this looks like I'm asking for a homework exercise, here's what
> > I'm using now.  It returns False or raises a ValueError exception for
> > invalid inputs.  I'm just wondering if there's an already-published
> > version.
> > def dms2int(dms):
> >     """Accepts an 8-character string of three two-digit numbers,
> > separated by exactly one non-numeric character, and converts it
> > to an integer, representing the number of seconds.  Think of
> > degree, minute, second notation, or time marked in hours,
> > minutes, and seconds (HH:MM:SS)."""
> >     return (
> >             len(dms) == 8
> >         and 00 <= int(dms[0:2]) < 24
> >         and dms[2] not in '0123456789'
> >         and 00 <= int(dms[3:5]) < 60
> >         and dms[5] not in '0123456789'
> >         and 00 <= int(dms[6:8]) < 60
> >         and int(dms[6:8]) + 60 * (int(dms[3:5]) + 60 * int(dms[0:2]))
> >         )
> 
> Have you considered time.strptime()?
> 
> BTW, your function, given "00:00:00" will return 0 -- you may well have
> trouble distinguishing that from False (note that False == 0), without
> resorting to ugliness like:
> 
>     if result is False ...
> 
> Instead of returning False for some errors and letting int() raise an
> exception for others, I would suggest raising ValueError yourself for
> *all* invalid input.
> 
> You may wish to put more restrictions on the separators ... I would be
> suspicious of cases where dms[2] != dms[5]. What plausible separators
> are there besides ":"? Why allow alphabetics? If there's a use case for
> "23h59m59s", that would have to be handled separately. Note that
> "06-12-31" could be a date, "12,34,56" could be CSV data.
> 
> Cheers,
> John
> 


You may also want to look at the dateutil module (especially dateutil.parse).




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