使用authenticate()和login()功能：
from django.contrib.auth import authenticate, login
def register(request):
if request.method == 'POST':
form = UserCreationForm(request.POST)
if form.is_valid():
new_user = form.save()
messages.info(request, "Thanks for registering. You are Now logged in.")
new_user = authenticate(username=form.cleaned_data['username'],
password=form.cleaned_data['password1'],
)
login(request, new_user)
return HttpResponseRedirect("/dashboard/")
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