'backports.zoneinfo.ZoneInfo' object has no attribute 'localize'

[Shavinder]

Here is my traceback:

Environment:

Request Method: GET
Request URL: http://127.0.0.1:8000/schedule/calendar/tri_month/example/

Django Version: 4.0
Python Version: 3.8.2
Installed Applications:
('django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.humanize',
'django.contrib.admin',
'debug_toolbar',
'djangobower',
'schedule',
'project_sample')
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'debug_toolbar.middleware.DebugToolbarMiddleware']

Traceback (most recent call last):
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\schedule\utils.py", line 221, in decorator
return function(request, *args, **kwargs)
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\django\views\generic\base.py", line 69, in view
return self.dispatch(request, *args, **kwargs)
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\django\views\generic\base.py", line 101, in dispatch
return handler(request, *args, **kwargs)
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\django\views\generic\detail.py", line 107, in get
context = self.get_context_data(object=self.object)
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\schedule\views.py", line 124, in get_context_data
period = period_class(event_list, date, tzinfo=local_timezone)
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\schedule\periods.py", line 259, in init
start, end = self._get_month_range(date)
File "C:\Users\sh\source\repos\django-scheduler-sample-master\venv\lib\site-packages\schedule\periods.py", line 322, in _get_month_range
local_start = self.tzinfo.localize(naive_start)

Exception Type: AttributeError at /schedule/calendar/tri_month/example/
Exception Value: 'backports.zoneinfo.ZoneInfo' object has no attribute 'localize'

[alterlai]

I'm also running into the same issue,

@Shavinder have you found a workaround?

[Shavinder]

I ve decided to use django swingtime. Its code is easier to understand. Plus it has a demo.

…

On Mon., Jan. 10, 2022, 6:33 a.m. Jeroen van der Laan < ***@***.***> wrote: I'm also running into the same issue, @Shavinder <https://github.com/Shavinder> have you found a workaround? — Reply to this email directly, view it on GitHub <#522 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAKYKTMY4LS27JIKRQWYFADUVLU43ANCNFSM5KYTIOBQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[raffael-mnhn]

I have the same issue on python 3.8

[raffael-mnhn]

This is related to changes in python 3.8. It can be mitigated using:
USE_DEPRECATED_PYTZ = True in your settings.

[llazzaro]

@raffael-mnhn thanks for the suggestion. I'm working on a fix, however, the current fix has some DST regressions.

[llazzaro]

Please check branch: 522-fix-backports-zoneinfo-ZoneInfo

[raffael-mnhn]

@llazzaro I just tried this out by removing django-scheduler from my requirements.txt and substituting it with git+https://github.com/llazzaro/django-scheduler.git@522-fix-backports-zoneinfo-ZoneInfo#egg=django-scheduler followed by pip install -r requirements.txt. Then I removed the USE_DEPRECATED_PYTZ = True from settings.py and ran the application. It starts up as it should and generally seems to have no problems.

Thanks for the fix!

[llazzaro]

Good to hear!
I think USE_DEPRECATED_PYTZ = True is not required with the fix.
I will try to publish on pipy