How to properly reverse the Django auth login?

There's definitely something wrong elsewhere in your urls. I'm able to reverse the auth login url pattern just fine:

from django.core.urlresolvers import reverse
print reverse('django.contrib.auth.views.login')

Use the admin URL namespace to get the login URL:

>>> from django.urls import reverse
>>> reverse('admin:login')
'/admin/login/'

See the relevant section of Django documentation. URL namespaces have been available since Django 1.1.

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