Re: function to convert degree (hour), minute, seconds string to integer
[EMAIL PROTECTED] 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 -- http://mail.python.org/mailman/listinfo/python-list
Re: function to convert degree (hour), minute, seconds string to integer
On Wed, 2006-07-26 at 20:18 -0700, John Machin wrote: > [EMAIL PROTECTED] 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). -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- http://mail.python.org/mailman/listinfo/python-list
Re: function to convert degree (hour), minute, seconds string to integer
In <[EMAIL PROTECTED]>, John Machin wrote: > 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. Looking at the subject I would expect to be able to give 76°04'54" as argument. Hm, but degrees don't map directly to hours!? Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: function to convert degree (hour), minute, seconds string to integer
John Machin wrote:
> [EMAIL PROTECTED] 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
>
> 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
Good point about 0/False. I don't think it would have bitten me in my
current program, given my expected (and filtered) inputs, but I might
have reused it in the future, and been bitten later.
I had looked at the time module, but apparently not long enough.
This does the trick:
def dms2int(dms):
int(time.mktime(time.strptime("2000-01-01 %s" % dms, "%Y-%m-%d
%H:%M:%S")))
I only need the minutes, but can work with seconds. The only downside
is that I'm hardcoding an arbitrary date, but I can deal with that.
Thanks for your help, John!
--dang
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Re: function to convert degree (hour), minute, seconds string to integer
[EMAIL PROTECTED] wrote:
> John Machin wrote:
> > [EMAIL PROTECTED] 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
> >
> > 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
>
> Good point about 0/False. I don't think it would have bitten me in my
> current program, given my expected (and filtered) inputs, but I might
> have reused it in the future, and been bitten later.
The bigger pain would have been two types of error handling
(try/except) *AND* if result is False
>
> I had looked at the time module, but apparently not long enough.
> This does the trick:
>
> def dms2int(dms):
> int(time.mktime(time.strptime("2000-01-01 %s" % dms, "%Y-%m-%d
> %H:%M:%S")))
>
> I only need the minutes, but can work with seconds. The only downside
> is that I'm hardcoding an arbitrary date, but I can deal with that.
>
That's a bit too elaborate. Python gives you the hard-coded date for
free -- then (you ingrate!) you ignore it, like this:
|>> import time
|>> dms = "23:48:59"
|>> t = time.strptime(dms, "%H:%M:%S")
|>> t
(1900, 1, 1, 23, 48, 59, 0, 1, -1)
|>> seconds = (t[3] * 60 + t[4]) * 60.0 + t[5]
|>> seconds
85739.0 # assuming you do want it as a float, not an int
Cheers,
John
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Re: function to convert degree (hour), minute, seconds string to integer
<[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> 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
In a froth of functionalism, here is my submission.
-- Paul
tests = """\
00:00:00
01:01:01
23:59:59
24:00:00
H1:00:00
12:34:56.789""".split("\n")
def time2secs(t,decimal=False):
if decimal:
tflds = map(float,t.split(":"))
else:
tflds = map(int,t.split(".")[0].split(":"))
nomorethan = lambda (a,maxa) : 0 <= a < maxa
if sum(map(nomorethan, zip(tflds,(24,60,60 == len(tflds):
return reduce(lambda a,b: a*60+b, tflds)
else:
raise ValueError("invalid time field value in '%s'" % str(t))
for tt in tests:
try:
print time2secs(tt)
print time2secs(tt,True)
except Exception,e:
print "%s: %s" % (e.__class__.__name__, e)
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