Django admin: TypeError on any post request

Question

I created a new Django (v. 1.11) project and using python manage.py createsuperuser I created a user. I can log in to the admin section on localhost:8888/admin with this user account. However, I cannot do anything else: whenever I trigger a POST request other than the login page, I get the following error:

TypeError at /admin/...

slice indices must be integers or None or have an __index__ method

("..." can be replaced for example by auth/group/add/), but this behavior is general, not specific to this request

The following traceback suggests problem with parsing the CSRF token from the page, but I didn't have such issues on other pages within my application apart from admin.

Traceback:

File "/usr/local/lib/python2.7/site-packages/django/core/handlers/exception.py" in inner
  41.             response = get_response(request)

File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py" in _get_response
  178.             response = middleware_method(request, callback, callback_args, callback_kwargs)

File "/usr/local/lib/python2.7/site-packages/django/middleware/csrf.py" in process_view
  298.                     request_csrf_token = request.POST.get('csrfmiddlewaretoken', '')

File "/usr/local/lib/python2.7/site-packages/django/core/handlers/wsgi.py" in _get_post
  126.             self._load_post_and_files()

File "/usr/local/lib/python2.7/site-packages/django/http/request.py" in _load_post_and_files
  299.                 self._post, self._files = self.parse_file_upload(self.META, data)

File "/usr/local/lib/python2.7/site-packages/django/http/request.py" in parse_file_upload
  258.         return parser.parse()

File "/usr/local/lib/python2.7/site-packages/django/http/multipartparser.py" in parse
  198.                         data = field_stream.read(size=read_size)

File "/usr/local/lib/python2.7/site-packages/django/http/multipartparser.py" in read
  369.         out = b''.join(parts())

File "/usr/local/lib/python2.7/site-packages/django/http/multipartparser.py" in parts
  364.                     emitting = chunk[:remaining]

Exception Type: TypeError at /admin/auth/group/add/
Exception Value: slice indices must be integers or None or have an __index__ method

Any ideas what could be the problem? Thanks in advance.

Answer 1

Found the problem.

For the future reference, the problem was the key DATA_UPLOAD_MAX_MEMORY_SIZE in the project settings having a floating point value (10e6 is an easy-to-overlook float in Python). It has to be an integer.