Introduction
croniter provides iteration for the datetime object with a cron like format.
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Website: https://github.com/kiorky/croniter
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Usage
A simple example:
>>> from croniter import croniter
>>> from datetime import datetime
>>> base = datetime(2010, 1, 25, 4, 46)
>>> iter = croniter('*/5 * * * *', base) # every 5 minutes
>>> print(iter.get_next(datetime)) # 2010-01-25 04:50:00
>>> print(iter.get_next(datetime)) # 2010-01-25 04:55:00
>>> print(iter.get_next(datetime)) # 2010-01-25 05:00:00
>>>
>>> iter = croniter('2 4 * * mon,fri', base) # 04:02 on every Monday and Friday
>>> print(iter.get_next(datetime)) # 2010-01-26 04:02:00
>>> print(iter.get_next(datetime)) # 2010-01-30 04:02:00
>>> print(iter.get_next(datetime)) # 2010-02-02 04:02:00
>>>
>>> iter = croniter('2 4 1 * wed', base) # 04:02 on every Wednesday OR on 1st day of month
>>> print(iter.get_next(datetime)) # 2010-01-27 04:02:00
>>> print(iter.get_next(datetime)) # 2010-02-01 04:02:00
>>> print(iter.get_next(datetime)) # 2010-02-03 04:02:00
>>>
>>> iter = croniter('2 4 1 * wed', base, day_or=False) # 04:02 on every 1st day of the month if it is a Wednesday
>>> print(iter.get_next(datetime)) # 2010-09-01 04:02:00
>>> print(iter.get_next(datetime)) # 2010-12-01 04:02:00
>>> print(iter.get_next(datetime)) # 2011-06-01 04:02:00
>>> iter = croniter('0 0 * * sat#1,sun#2', base)
>>> print(iter.get_next(datetime)) # datetime.datetime(2010, 2, 6, 0, 0)
All you need to know is how to use the constructor and the get_next method, the signature of these methods are listed below:
>>> def __init__(self, cron_format, start_time=time.time(), day_or=True)
croniter iterates along with cron_format from start_time. cron_format is min hour day month day_of_week, you can refer to http://en.wikipedia.org/wiki/Cron for more details. The day_or switch is used to control how croniter handles day and day_of_week entries. Default option is the cron behaviour, which connects those values using OR. If the switch is set to False, the values are connected using AND. This behaves like fcron and enables you to e.g. define a job that executes each 2nd friday of a month by setting the days of month and the weekday.
>>> def get_next(self, ret_type=float)
get_next calculates the next value according to the cron expression and returns an object of type ret_type. ret_type should be a float or a datetime object.
Supported added for get_prev method. (>= 0.2.0):
>>> base = datetime(2010, 8, 25)
>>> itr = croniter('0 0 1 * *', base)
>>> print(itr.get_prev(datetime)) # 2010-08-01 00:00:00
>>> print(itr.get_prev(datetime)) # 2010-07-01 00:00:00
>>> print(itr.get_prev(datetime)) # 2010-06-01 00:00:00
You can validate your crons using is_valid class method. (>= 0.3.18):
>>> croniter.is_valid('0 0 1 * *') # True
>>> croniter.is_valid('0 wrong_value 1 * *') # False
About DST
Be sure to init your croniter instance with a TZ aware datetime for this to work !:
>>> local_date = tz.localize(datetime(2017, 3, 26))
>>> val = croniter('0 0 * * *', local_date).get_next(datetime)
Develop this package
git clone https://github.com/kiorky/croniter.git cd croniter virtualenv --no-site-packages venv . venv/bin/activate pip install --upgrade -r requirements/test.txt py.test src
Make a new release
We use zest.fullreleaser, a great release infrastructure.
Do and follow these instructions
. venv/bin/activate pip install --upgrade -r requirements/release.txt fullrelease
Contributors
Thanks to all who have contributed to this project! If you have contributed and your name is not listed below please let me know.
mrmachine
Hinnack
shazow
kiorky
jlsandell
mag009
djmitche
GreatCombinator
chris-baynes
ipartola
yuzawa-san
Changelog
0.3.24 (2018-06-20)
unreleased - fix #107: microsecond threshold
0.3.23 (2018-05-23)
fix get_next while perserving the fix of get_prev in 7661c2aaa [Avikam Agur <avikam@pagaya-inv.com>]
0.3.22 (2018-05-16)
Don’t count previous minute if now is dynamic If the code is triggered from 5-asterisk based cron get_prev based on datetime.now() is expected to return current cron iteration and not previous execution. [Igor Khrol <igor.khrol@toptal.com>]
0.3.20 (2017-11-06)
More DST fixes [Kevin Rose <kbrose@github>]
0.3.19 (2017-08-31)
fix #87: backward dst changes [kiorky]
0.3.18 (2017-08-31)
Add is valid method, refactor errors [otherpirate, Mauro Murari <mauro_murari@hotmail.com>]
0.3.17 (2017-05-22)
DOW occurence sharp style support. [kiorky, Kengo Seki <sekikn@apache.org>]
0.3.16 (2017-03-15)
Better test suite [mrcrilly@github]
DST support [kiorky]
0.3.15 (2017-02-16)
fix bug around multiple conditions and range_val in _get_prev_nearest_diff. [abeja-yuki@github]
0.3.14 (2017-01-25)
issue #69: added day_or option to change behavior when day-of-month and day-of-week is given [Andreas Vogl <a.vogl@hackner-security.com>]
0.3.13 (2016-11-01)
0.3.12 (2016-03-10)
support setting ret_type in __init__ [Brent Tubbs <brent.tubbs@gmail.com>]
0.3.11 (2016-01-13)
Bug fix: The get_prev API crashed when last day of month token was used. Some essential logic was missing. [Iddo Aviram <iddo.aviram@similarweb.com>]
0.3.10 (2015-11-29)
The fuctionality of ‘l’ as day of month was broken, since the month variable was not properly updated [Iddo Aviram <iddo.aviram@similarweb.com>]
0.3.9 (2015-11-19)
Don’t use datetime functions python 2.6 doesn’t support [petervtzand]
0.3.8 (2015-06-23)
Truncate microseconds by setting to 0 [Corey Wright]
0.3.7 (2015-06-01)
converting sun in range sun-thu transforms to int 0 which is recognized as empty string; the solution was to convert sun to string “0”
0.3.6 (2015-05-29)
Fix default behavior when no start_time given Default value for start_time parameter is calculated at module init time rather than call time.
Fix timezone support and stop depending on the system time zone
0.3.5 (2014-08-01)
support for ‘l’ (last day of month)
0.3.4 (2014-01-30)
Python 3 compat
QA Relase
0.3.3 (2012-09-29)
proper packaging
Metadata
Release files for croniter 0.3.24
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