#22625: Installing pytz breaks code already using django's timezone module
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Reporter: tom.michaelis@… | Owner: nobody
Type: Bug | Status: new
Component: Utilities | Version: 1.6
Severity: Normal | Keywords: pytz, timezone
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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pytz is an optional module for Django, used in django.utils.timezone (and
possibly elsewhere). The documentation recommends that pytz is installed,
but it's not a requirement.
The bug is that after installing pytz, methods in django's timezone module
do not present the same interface as before installation. Installing an
optional module should not adjust the interface presented.
The following code works differently before and after installation of
pytz:
{{{
from django.utils import timezone
now = timezone.now()
timezone.make_aware(now, timezone.utc())
}}}
Before installing pytz, timezone.make_aware essentially does nothing (the
variable is already timezone aware). After installing pytz,
timezone.make_aware makes a call to pytz which raises 'ValueError: Not
naive datetime (tzinfo is already set)', and causes everything to break.
While I discovered this in django 1.5, I've also been able to replicate
the bug in django 1.6, so I am filing the bug report under that.
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Ticket URL: <https://code.djangoproject.com/ticket/22625>
Django <https://code.djangoproject.com/>
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