Programming Forums > Script Programming > Python

Dietrich · Jan 28th, 2006, 2:37 PM

Quote:

Originally Posted by Arevos

But %e is subtly different from %d. %d creates "01", whilst %e creates " 1".

Thanks a lot,
in a few days I would have seen this. Now I have to add some string processing to remove the leading zero.

Arevos, you are a genius!

Steveire · Jan 29th, 2006, 9:08 AM

Bingo. Thanks very.

Sane · Mar 7th, 2006, 8:02 PM

I was wondering if there was an easier way to do the following:

(Toggle Plain Text)

from time import ctime, mktime, time

def ctime_to_epoch(ctime):
    x1 = ctime.split(' ')
    x2 = x1[3].split(':')
    localtime = (int(x1[-1]),
                 {"Jan":1,"Feb":2,"Mar":3,"Apr":4,
                  "May":5,"Jun":6,"Jul":7,"Aug":8,
                  "Sep":9,"Oct":10,"Nov":11,"Dec":12}[x1[1]],
                 int(x1[2]),int(x2[0]),int(x2[1]),int(x2[2]),0,0,0)
    return mktime(localtime)

ctime = ctime()
time = time()

print ctime_to_epoch(ctime)
print time

Converting a ctime literal back to seconds since epoch. I need to take forum post times and determine which posts are new by converting post times to epoch and comparing it to the epoch of his/her last visit.

hydroxide · Mar 7th, 2006, 11:57 PM

Quote:

Originally Posted by Sane

I was wondering if there was an easier way to do the following:

(Toggle Plain Text)

import time

def timestr_to_epoch(timestr):
    localtime = time.strptime(timestr, "%a %b %d %H:%M:%S %Y")
    return time.mktime(localtime)

print timestr_to_epoch(time.ctime())
print time.time()

--OH.

Sane · Mar 8th, 2006, 4:26 PM

Thanks. I wonder which is faster though.

hydroxide · Mar 8th, 2006, 7:49 PM

Quote:

Originally Posted by Sane

Thanks. I wonder which is faster though.

Oh yours is about 4 times faster, but mine is easier to write, easier to maintain, easier to modify, easier to verify, easier to read, and easier to understand, so it's better*

(Toggle Plain Text)

import this

--OH.
*(If you have to process millions of dates in one go, and must have the speed, then yes, a hand-rolled problem-specific solution such as yours may be necessary. If you don't, the fraction of a second advantage is outweighed by the other factors)

Sane · Mar 9th, 2006, 7:39 AM

Well not necessary "millions", but every forum they visit, every topic must have its last post's date converted to epoch to be compared with the user's last visit.

I had to do it awkwardly like this, because I forgot to incorporate new posts in to my forums when I was first programming them. But adding this in didn't change the speed of the forums noticably at all.

Mar 7th, 2006, 8:02 PM	#13
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,076 Rep Power: 6	I was wondering if there was an easier way to do the following: (Toggle Plain Text) from time import ctime, mktime, time def ctime_to_epoch(ctime): x1 = ctime.split(' ') x2 = x1[3].split(':') localtime = (int(x1[-1]), {"Jan":1,"Feb":2,"Mar":3,"Apr":4, "May":5,"Jun":6,"Jul":7,"Aug":8, "Sep":9,"Oct":10,"Nov":11,"Dec":12}[x1[1]], int(x1[2]),int(x2[0]),int(x2[1]),int(x2[2]),0,0,0) return mktime(localtime) ctime = ctime() time = time() print ctime_to_epoch(ctime) print time from time import ctime, mktime, time def ctime_to_epoch(ctime): x1 = ctime.split(' ') x2 = x1[3].split(':') localtime = (int(x1[-1]), {"Jan":1,"Feb":2,"Mar":3,"Apr":4, "May":5,"Jun":6,"Jul":7,"Aug":8, "Sep":9,"Oct":10,"Nov":11,"Dec":12}[x1[1]], int(x1[2]),int(x2[0]),int(x2[1]),int(x2[2]),0,0,0) return mktime(localtime) ctime = ctime() time = time() print ctime_to_epoch(ctime) print time Converting a ctime literal back to seconds since epoch. I need to take forum post times and determine which posts are new by converting post times to epoch and comparing it to the epoch of his/her last visit.

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Jan 29th, 2006, 9:08 AM	#12
Steveire Newbie Join Date: Jan 2006 Posts: 13 Rep Power: 0	Bingo. Thanks very.

Mar 8th, 2006, 4:26 PM	#15
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,076 Rep Power: 6	Thanks. I wonder which is faster though.

Mar 9th, 2006, 7:39 AM	#17
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 2,076 Rep Power: 6	Well not necessary "millions", but every forum they visit, every topic must have its last post's date converted to epoch to be compared with the user's last visit. I had to do it awkwardly like this, because I forgot to incorporate new posts in to my forums when I was first programming them. But adding this in didn't change the speed of the forums noticably at all.

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Programming Forums > Script Programming > Python

I can print 'today', but can I print 'yesterday'?