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

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

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