Django asked me to install pytz, and now my models will not check Django

Question

I was getting this error when testing a project that I just set up

Exception Type: ImproperlyConfigured Exception Value: This query requires pytz, but it isn't installed. 

After a little google search, I found myself getting this because in my settings I specified

 USE_TZ = True 

which, I believe, should inform my time zone about the project.

So, I ran sudo pip install pytz to install pytz so that I don't get this error. The problem is that now that pytz is installed, my models will not check when I try to do ./manage.py runserver and I get this error

 Traceback (most recent call last): File "./manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line utility.execute() File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/core/management/__init__.py", line 354, in execute django.setup() File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/__init__.py", line 18, in setup from django.utils.log import configure_logging File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/utils/log.py", line 10, in <module> from django.views.debug import ExceptionReporter, get_exception_reporter_filter File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/views/debug.py", line 10, in <module> from django.http import (HttpResponse, HttpResponseServerError, File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/http/__init__.py", line 4, in <module> from django.http.response import (HttpResponse, StreamingHttpResponse, File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/http/response.py", line 13, in <module> from django.core.serializers.json import DjangoJSONEncoder File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/core/serializers/__init__.py", line 23, in <module> from django.core.serializers.base import SerializerDoesNotExist File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/core/serializers/base.py", line 6, in <module> from django.db import models File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/db/models/__init__.py", line 6, in <module> from django.db.models.query import Q, QuerySet, Prefetch # NOQA File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/db/models/query.py", line 13, in <module> from django.db.models.fields import AutoField, Empty File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/db/models/fields/__init__.py", line 15, in <module> from django.db.models.lookups import default_lookups, RegisterLookupMixin File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/db/models/lookups.py", line 6, in <module> from django.utils import timezone File "/Users/user/.virtualenvs/app/lib/python3.4/site-packages/django/utils/timezone.py", line 149, in <module> utc = pytz.utc if pytz else UTC() AttributeError: 'module' object has no attribute 'utc' 

What's going on here? Why did I get this error? For me, it seems like the problem comes from pytz, but I'm not sure. Any help would be greatly appreciated.

Here is my model that worked great before installing pytz

 from django.db import models from django.conf import settings # Create your models here. class Item(models.Model): title = models.CharField(max_length=100, ) description = models.TextField() seller = models.ForeignKey(settings.AUTH_USER_MODEL) price = models.DecimalField(max_digits=11, decimal_places=2) timestamp = models.DateTimeField(auto_now_add=True) last_updated = models.DateTimeField(auto_now=True) def __str__(self): return self.title 

Edit: I added the views.py file

 from .models import Item from django.views.generic import ListView, DetailView class ItemListView(ListView): model = Item class ItemDetailView(DetailView): model = Item def get_context_data(self, **kwargs): # Call the base implementation first to get a context #This is getting a dictionary of the objects being displayed to #the template context = super(ItemDetailView, self).get_context_data(**kwargs) # Add in a QuerySet of all items up for trade by the user context['other_things_for_trade_by_user'] = Item.objects.filter(seller=context['seller']) return context 

Answer 1

As expected, this question was caused by a mismatch between the pytz and django versions. This was fixed by removing pytz and django and reinstalling them as with pip.