Is there a way to make python create a list of Mondays for a given year?
For example,
mondays = ['1/3/2005','1/10/2005','1/17/2005','1/24/2005',
'1/31/2005','2/7/2005', ... ] 9 11179
Chris> Is there a way to make python create a list of Mondays for a
Chris> given year? For example,
Chris> mondays = ['1/3/2005','1/10/2005','1/17/2005','1/24/2005',
Chris> '1/31/2005','2/7/2005', ... ]
How about:
import datetime
oneday = datetime.timede lta(days=1)
oneweek = datetime.timede lta(days=7)
year = 2005
start = datetime.date(y ear=year, month=1, day=1)
while start.weekday() != 0:
start += oneday
days = []
while start.year == year:
days.append(sta rt)
start += oneweek
print days
Skip
Chris wrote: Is there a way to make python create a list of Mondays for a given year?
For example,
mondays = ['1/3/2005','1/10/2005','1/17/2005','1/24/2005', '1/31/2005','2/7/2005', ... ]
from datetime import date, timedelta
def mondays(year):
'''generate all days that are Mondays in the given year'''
jan1 = date(year, 1, 1)
# find first Monday (which could be this day)
monday = jan1 + timedelta(days= (7-jan1.weekday()) % 7)
while 1:
if monday.year != year:
break
yield monday
monday += timedelta(days= 7) [str(x) for x in mondays(2005)]
['2004-01-05', '2004-01-12', ... '2004-12-27']
Extension to support any day of the week (including renaming the
function!) is left as an exercise to the reader. ;-)
--
Peter
"Chris" <se***@yahoo.co m> wrote: Is there a way to make python create a list of Mondays for a given year?
For example,
mondays = ['1/3/2005','1/10/2005','1/17/2005','1/24/2005', '1/31/2005','2/7/2005', ... ]
Get the dateutil package ( https://moin.conectiva.com.br/DateUtil):
import dateutil.rrule as rrule
from datetime import date
mondays2005 = tuple(rrule.rru le(rrule.WEEKLY ,
dtstart=date(20 05,1,1),
count=52,
byweekday=rrule .MO))
George
Consider also dateutil written by Gustavo Niemeyer
and found at: https://moin.conectiva.com.br/DateUtil from dateutil.rrule import * list(rrule(WEEK LY, byweekday=MO, dtstart=date(20 05,1,1), until=date(2005 ,12,31)))
The library may be a little intimidating at first it is worth learning.
waldek
George Sakkis wrote: "Chris" <se***@yahoo.co m> wrote:Is there a way to make python create a list of Mondays for a given year?
Get the dateutil package (https://moin.conectiva.com.br/DateUtil):
import dateutil.rrule as rrule from datetime import date
mondays2005 = tuple(rrule.rru le(rrule.WEEKLY , dtstart=date(20 05,1,1), count=52, byweekday=rrule .MO))
Count should probably be at least "53" to catch the years when there are
that many Mondays.... such as 2001. Unfortunately, I suspect that will
screw it up for other years where there are only 52 (but I don't know
this dateutil package so someone who does would have to say for sure).
-Peter
Chris <se***@yahoo.co m> writes: Is there a way to make python create a list of Mondays for a given year? mondays = ['1/3/2005','1/10/2005','1/17/2005','1/24/2005', '1/31/2005','2/7/2005', ... ]
This is pretty inefficient but it's conceptually the simplest:
def mondays(year):
from calendar import weekday, monthrange
return [('%d/%d/%d'%(month,day, year))
for month in xrange(1,13)
for day in xrange(1,1+mont hrange(year,mon th)[1])
if weekday(year,mo nth,day) == 0]
"Peter Hansen" <pe***@engcorp. com> wrote: George Sakkis wrote: "Chris" <se***@yahoo.co m> wrote:Is there a way to make python create a list of Mondays for a given year?
Get the dateutil package (https://moin.conectiva.com.br/DateUtil):
import dateutil.rrule as rrule from datetime import date
mondays2005 = tuple(rrule.rru le(rrule.WEEKLY , dtstart=date(20 05,1,1), count=52, byweekday=rrule .MO))
Count should probably be at least "53" to catch the years when there are that many Mondays.... such as 2001. Unfortunately, I suspect that will screw it up for other years where there are only 52 (but I don't know this dateutil package so someone who does would have to say for sure).
-Peter
Sorry, my bad; waldek in the post below got it right. Here's yet
another way that doesn't use the count or until keywords: from itertools import takewhile mondays2001 = tuple(takewhile (lambda d: d.year==2001,
rrule.rrule(rru le.WEEKLY,
dtstart=date(20 01,1,1),
byweekday=rrule .MO))) print len(mondays2001 )
53
George
Thanks to everyone for your help!
That fit the need perfectly.
In article <MP************ ************@ne ws2.atlantic.ne t>, se***@yahoo.com says... Is there a way to make python create a list of Mondays for a given year?
For example,
mondays = ['1/3/2005','1/10/2005','1/17/2005','1/24/2005', '1/31/2005','2/7/2005', ... ]
On Mon, 19 Sep 2005 12:10:04 GMT, Chris <se***@yahoo.co m> wrote: Thanks to everyone for your help!
That fit the need perfectly.
In article <MP************ ************@ne ws2.atlantic.ne t>, se***@yahoo.com says... Is there a way to make python create a list of Mondays for a given year?
For example,
mondays = ['1/3/2005','1/10/2005','1/17/2005','1/24/2005', '1/31/2005','2/7/2005', ... ]
You can also calculate it using the Julian Day Number. Google on
astronomical calculations, or read the introduction to one of the
Numerical Recipies. . . books for a discussion and algorithm. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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