<form method="post" action="{% url 'django.contrib.auth.views.login' %}">

[bartek.rychlicki@…]

​https://docs.djangoproject.com/en/dev/topics/auth/#django.contrib.auth.views.login
contains a sample login form which will throw
NoReverseMatch: Reverse for django.contrib.auth.views.login with arguments '()' and keyword arguments '{}' not found.

the code:
<form method="post" action="{% url 'django.contrib.auth.views.login' %}">
should be
<form method="post" action="{% url django.contrib.auth.views.login %}">
which fixes the problem

my django is 1.4

[Russell Keith-Magee]

You're using the documentation for the development version, but pointing using Django 1.4. If you use the ​documentation for Django 1.4, you'll see that there is a {% load url from future %} tag required. This is due to a change int he {% url %} tag that we have been phasing in since Django 1.3. See the ​Django 1.3 release notes for more details.