Django problem with creating user then logging them in
def signup(request):
    if request.method == 'POST': # If the form has been submitted...
        p = request.POST
        if not request.user.is_authenticated():
            form = UserForm(request.POST) # A form bound to the POST data
            if form.is_valid(): # All validation rules pass
                # Process the data in form.cleaned_data
                # ...
                form.save()
                user=authenticate(username=p['username'],password=p['password'])
                login(request,user)
                return HttpResponseRedirect('/') # Redirect after POST

Traceback:
 File "/Library/Python/2.6/site-packages/django/core/handlers/base.py" in get_response
   100.                     response = callback(request, *callback_args, **callback_kwargs)
 File "REDACTED/views.py" in signup
   19.                 login(request,user)
 File "/Library/Python/2.6/site-packages/django/contrib/auth/__init__.py" in login
   71.     user.save()
 File "/Library/Python/2.6/site-packages/django/contrib/auth/models.py" in save
   430.         raise NotImplementedError

 Exception Type: NotImplementedError at /signup/
 Exception Value:

user = UserForm.save()
login(request, user)

user.passord = password

username = form.cleaned_data['username']
password = form.cleaned_data['password']

user = User.objects.create(username=username)
if password:
    user.set_password(password)
else:
    user.set_unusable_password()
user.save()

username = form.cleaned_data['username']
password = form.cleaned_data['password']
hashed_password = hashlib.md5(password).hexdigest()

user = authenticate(username=username, password=hashed_password)
if user:
    login(request, user)
    return HttpResponseRedirect('/')

# forms.py
from django import forms


class LoginForm(forms.Form):
    username = forms.CharField(max_length=20)
    password = forms.CharField(widget=forms.PasswordInput)


# views.py
import hashlib

username = form.cleaned_data['username']
password = form.cleaned_data['password']
hashed_password = hashlib.md5(password).hexdigest()

# assuming username is unique
User.objects.get_or_create(username=username, defaults={'password': hashed_password, 'is_active': True})

# If password doesn't work, try hashed_password next
user = authenticate(username=username, password=password)
if user:
    login(request, user)
    return HttpResponseRedirect('/')