In views.py, following from linked tutorial

class PasswordResetConfirmView(FormView):
 template_name = "registration/password_reset_confirm.html"
 success_url = 'registration/password_reset_complete.html'
 form_class = SetPasswordForm


 def post(self, request, uidb64=None, token=None, *arg, **kwargs):
    """
    View that checks the hash in a password reset link and presents a
    form for entering a new password.
    """
    UserModel = get_user_model()
    form = self.form_class(request.POST)
    assert uidb64 is not None and token is not None  # checked by URLconf
    try:
        uid = urlsafe_base64_decode(uidb64)
        user = UserModel._default_manager.get(pk=uid)
    except (TypeError, ValueError, OverflowError,UserModel.DoesNotExist):
          user = None

    if user is not None and default_token_generator.check_token(user,
    token):
        if form.is_valid():
            new_password= form.cleaned_data['new_password2']
            user.set_password(new_password)
            user.save()
            messages.success(request, 'Password has been reset.')
            return self.form_valid(form)
        else:

          messages.error(request, 'Password reset has not been
          unsuccessful.')
          return self.form_invalid(form)
    else:
        messages.error(request,'The reset password link is no longevalid.')
        return self.form_invalid(form)```


In urls.py


url(r'^account/password_reset/', ResetPasswordRequestView.as_view(),
name="reset_password"),
url(r'^account/password/reset/done/', ResetPasswordRequestView.as_view(),
name="reset_password_done"),
url(r'^reset/(?P<uidb64>[0-9A-Za-z]+)/(?P<token>.+)/$',
PasswordResetConfirmView.as_view(),name='password_reset_confirm'),

In password_reset_confirm.html in the Registration folder

{% extends 'base.html' %}



{% block title %}Enter new password{% endblock %}
{% block content %}
<h1>Set a new password!</h1>
<form method="POST">
 {% csrf_token %}
 {{ form.as_p }}
 <input type="submit" value="Change my password">
</form>
{% endblock %}