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To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: A dateutil error has appeared, due to updates?  How to fix?
Date: Sun, 23 Sep 2012 13:38:15 +0200
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References: <vj43j9-df9.ln1@chris.zbmc.eu>
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Xref: csiph.com comp.lang.python:29808

tinnews@isbd.co.uk wrote:

> I have a python script which uses the dateutil module with the
> following:-
> 
>     import sys
>     import datetime
>     import icalendar
>     from dateutil.relativedelta import relativedelta
> 
> The section of code which uses relativedelta is as follows:-
> 
>         #
>         #
>         # If the event is a repeating event with a start date in the
>         # past then we add the repeat interval until we find the next
>         # occurrence
>         #
>         if eventDate < datetime.date.today():
>             if event.has_key('RRULE'):
>                 freq = event.decoded('RRULE')['FREQ'][0]
>                 if event.decoded('RRULE').has_key('INTERVAL'):
>                     interval = event.decoded('RRULE')['INTERVAL'][0]
>                 else:
>                     interval = 1;
>                 if 'WEEKLY' == freq:
>                     delta = relativedelta(weeks=+interval)
>                 if 'MONTHLY' == freq:
>                     delta = relativedelta(months=+interval)
>                 if 'YEARLY' == freq:
>                     delta = relativedelta(years=+interval)
>                 while eventDate < datetime.date.today():
>                     eventDate += delta
>             else:
>                 continue        # if it's a non-repeating event in the
>                 past
> 
> 
> It used to work and all I have done meanwhile is to update my xubuntu
> system as fixes are released.  I'm now getting the error:-
> 
>     Traceback (most recent call last):
>       File "/home/chris/bin/calics.py", line 62, in <module>
>         eventDate += delta
>       File "/usr/lib/python2.7/dist-packages/dateutil/relativedelta.py",
>       line 261, in __radd__
>         day = min(calendar.monthrange(year, month)[1],
>     AttributeError: 'module' object has no attribute 'monthrange'
> 
> Have I lost a module somewhere in the updates or has something in
> python changed such that my code no longer works as it used to?
> 
> Can anyone help diagnose this please.

You probably have a file named calendar.py in your working directory:

$ python -c 'from dateutil.relativedelta import calendar; print 
calendar.__file__'
/usr/lib/python2.7/calendar.pyc
$ touch calendar.py
$ python -c 'from dateutil.relativedelta import calendar; print 
calendar.__file__'
calendar.py

Rename calendar.py in your working directory (and don't forget to delete the 
corresponding calendar.pyc) -- and dateutil should work again.