Issues with Django and pytz - django

Question

I've followed the time zone documentation on the Django site with no luck. My issue is that I have a select box on my template that should be populated with common timezones provided by pytz, but, for whatever reason it's empty.
My end goal is to allow users to select their own time zone.
Any help is appreciated, thanks in advance.
view.py:
def set_timezone(request):
if request.method == 'POST':
request.session['django_timezone'] = pytz.timezone(request.POST['timezone'])
return redirect('/')
else:
return render(request, 'n2w/leads.html', {'timezones': pytz.common_timezones})
leads.html:
{% load tz %}
{{ datetime }}
<form action="" method="POST">
{% csrf_token %}
<label for="timezone">Time zone:</label>
<select name="timezone">
{% for tz in timezones %}
<option value="{{ tz }}"{% if tz == TIME_ZONE %} selected="selected"{% endif %}>{{ tz }}</option>
{% endfor %}
</select>
<input type="submit" value="Set" />
</form>
settings.py:
MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.timezone.TimeZoneMiddleware',
# Uncomment the next line for simple clickjacking protection:
# 'django.middleware.clickjacking.XFrameOptionsMiddleware',
)
INSTALLED_APPS = (
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
#'django.contrib.sites',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.admin',
'django.contrib.admindocs',
'registration',
'django.contrib.humanize',
'n2w',
'n2api',
'dajaxice',
'pytz',
)
middleware class (timezone.py):
from django.utils import timezone
class TimeZoneMiddleware(object):
def process_request(self, request):
tz = request.session.get('django_timezone')
if tz:
timezone.activate(tz)

Answer 1

I think you are probably raising a NameError or something. Try importing pytz:
from pytz import common_timezones
...
...
return render(request, 'n2w/leads.html', {'timezones': common_timezones})

Answer 2

After upgrading my Python installation from 2.7.1 -> 2.7.3, I was able to import pytz flawlessly. Thanks for all your help!