Traceback

## form
request.POST= <QueryDict: {u'go': [u'Go'], u'csrfmiddlewaretoken': [u'N95FTIcEVsslOCSdP3pPhmYlQBaOj2me'], u'flag1': [u'on']}>
form= {'files': {}, 'is_bound': True, 'error_class': <class 'django.forms.util.ErrorList'>, 'empty_permitted': False, 'fields': {'flag1': <django.forms.fields.BooleanField object at 0x7f606c0320d0>, 'flag2': <django.forms.fields.BooleanField object at 0x7f606c032d90>}, 'initial': {}, 'label_suffix': u':', 'prefix': None, '_changed_data': None, 'data': <QueryDict: {u'go': [u'Go'], u'csrfmiddlewaretoken': [u'N95FTIcEVsslOCSdP3pPhmYlQBaOj2me'], u'flag1': [u'on']}>, '_errors': None, 'auto_id': u'id_%s'}
[31/Aug/2014 10:03:44] "POST / HTTP/1.1" 500 71727

## page.html
<html>
  <head>
    <title>My trivial page</title>
  </head>
  <body>
    <h1>My trivial page</h1>

    <form method="POST">
      {% csrf_token %}
      <table>
        {{ form }}
      </table>

      <input type="submit" name="go" value="Go" />
    </form>
  </body>
</html>

## Traceback
Environment:


Request Method: POST
Request URL: http://localhost:8001/

Django Version: 1.5.7
Python Version: 2.7.5
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'trivial')
Installed Middleware:
('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')


Traceback:
File "/home/mjd/git/env/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  115.                         response = callback(request, *callback_args, **callback_kwargs)
File "/home/mjd/git/django-trivial/trivial/trivial/views.py" in main
  14.         assert form.is_valid()

Exception Type: AssertionError at /
Exception Value:

## views.py
from django.shortcuts import render
from django import forms

class FlagsForm(forms.Form):
    flag1 = forms.BooleanField(initial=True)
    flag2 = forms.BooleanField(initial=False)

def main(request):
    if request.method == 'POST':
        print "request.POST=", request.POST
        form = FlagsForm(request.POST)
        print "form=", form.__dict__

        assert form.is_valid()

    form = FlagsForm()
    return render(request, 'page.html', {'form': form})