Invalid password format or unknown hashing algorithm
django
Solution
Instead of setting your password to an empty string, set the password as unusable using `set_unusable_password()` method of `User` model:
user.set_unusable_password()
See more in the documentation: https://docs.djangoproject.com/en/dev/topics/auth/#django.contrib.auth.models.User.set_unusable_password
Problem
One of the users on my site recently managed to trigger this traceback while attempting to login. In Django Admin, his password reads `Invalid password format or unknown hashing algorithm.` I have no idea what might have caused this. So far this has been an isolated case and I and other users have managed to successfully sign up and login to the site. Traceback ``` Traceback (most recent call last): File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response response = callback(request, *callback_args, **callback_kwargs) File "/var/git/bbox/userprofile/views.py", line 67, in login_view if form.is_valid(): File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/forms/forms.py", line 124, in is_valid return self.is_bound and not bool(self.errors) File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/forms/forms.py", line 115, in _get_errors self.full_clean() File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/forms/forms.py", line 271, in full_clean self._clean_form() File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/forms/forms.py", line 299, in _clean_form self.cleaned_data = self.clean() File "/var/git/bbox/userprofile/forms.py", line 83, in clean self.user_cache = authenticate(username=username, password=password) File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 45, in authenticate user = backend.authenticate(**credentials) File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/contrib/auth/backends.py", line 15, in authenticate if user.check_password(password): File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/contrib/auth/models.py", line 304, in check_password return check_password(raw_password, self.password, setter) File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/contrib/auth/hashers.py", line 42, in check_password hasher = get_hasher(algorithm) File "/home/gituser/.virtualenvs/bbox/lib/python2.7/site-packages/django/contrib/auth/hashers.py", line 115, in get_hasher "setting?" % algorithm) ValueError: Unknown password hashing algorithm ''. Did you specify it in the PASSWORD_HASHERS setting? ```