Upgrade django 1.8 to 1.9

[Olivetree]

I am upgrading from django 1.8.4 to 1.9.13. I installed django 1.9.3 and added to my settings

{{
import django
django.setup()
}}}

My application no longer works, it displays the following error:

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7f9c9655b158>
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/django/utils/autoreload.py", line 226, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/django/core/management/commands/runserver.py", line 116, in inner_run
    self.check(display_num_errors=True)
  File "/usr/local/lib/python3.4/dist-packages/django/core/management/base.py", line 426, in check
    include_deployment_checks=include_deployment_checks,
  File "/usr/local/lib/python3.4/dist-packages/django/core/checks/registry.py", line 75, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/usr/local/lib/python3.4/dist-packages/django/core/checks/urls.py", line 13, in check_url_config
    return check_resolver(resolver)
  File "/usr/local/lib/python3.4/dist-packages/django/core/checks/urls.py", line 23, in check_resolver
    for pattern in resolver.url_patterns:
  File "/usr/local/lib/python3.4/dist-packages/django/utils/functional.py", line 33, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/usr/local/lib/python3.4/dist-packages/django/core/urlresolvers.py", line 417, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/usr/local/lib/python3.4/dist-packages/django/utils/functional.py", line 33, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/usr/local/lib/python3.4/dist-packages/django/core/urlresolvers.py", line 410, in urlconf_module
    return import_module(self.urlconf_name)
  File "/usr/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1471, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "/home/me/work/test_upgrade_django_to_1_11/be/myapp/urls.py", line 7, in <module>
    from django.contrib.auth.views import login, logout
  File "/usr/local/lib/python3.4/dist-packages/django/contrib/auth/views.py", line 11, in <module>
    from django.contrib.auth.forms import (
  File "/usr/local/lib/python3.4/dist-packages/django/contrib/auth/forms.py", line 10, in <module>
    from django.contrib.auth.models import User
  File "/usr/local/lib/python3.4/dist-packages/django/contrib/auth/models.py", line 6, in <module>
    from django.contrib.contenttypes.models import ContentType
  File "/usr/local/lib/python3.4/dist-packages/django/contrib/contenttypes/models.py", line 161, in <module>
    class ContentType(models.Model):
  File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py", line 102, in __new__
    "INSTALLED_APPS." % (module, name)
RuntimeError: Model class django.contrib.contenttypes.models.ContentType doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.

---

I can not even run migrations ...
In my settings I have:

(...)

import django
django.setup()

(...)

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.admin',
    'myapp',
    #'debug_toolbar',
    'django_extensions',
    'corsheaders',
    'watson',
    'raven.contrib.django.raven_compat',
    #'django.contrib.admindocs',
    'django_mailbox',
    'django.contrib.postgres',
)

(...)

---

I'm using python3.4 and postgresql9.3

[Tim Graham]

Please see TicketClosingReasons/UseSupportChannels for ways to get help. If you confirm a bug in Django, then please open a ticket with details.

I will say that there's no need to call django.setup() in your settings.

[Olivetree]

If I don't call django.setup() I have a diferente error:

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7effd13cbbf8>
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/django/utils/autoreload.py", line 226, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/django/core/management/commands/runserver.py", line 109, in inner_run
    autoreload.raise_last_exception()
  File "/usr/local/lib/python3.4/dist-packages/django/utils/autoreload.py", line 249, in raise_last_exception
    six.reraise(*_exception)
  File "/usr/local/lib/python3.4/dist-packages/django/utils/six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib/python3.4/dist-packages/django/utils/autoreload.py", line 226, in wrapper
    fn(*args, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python3.4/dist-packages/django/apps/registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "/usr/local/lib/python3.4/dist-packages/django/apps/config.py", line 90, in create
    module = import_module(entry)
  File "/usr/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1471, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "/home/me/work/test_upgrade_django_to_1_11/be/myapp/__init__.py", line 1, in <module>
    import myapp.signals
  File "/home/me/work/test_upgrade_django_to_1_11/be/myapp/signals.py", line 6, in <module>
    from django.contrib.auth.models import User
  File "/usr/local/lib/python3.4/dist-packages/django/contrib/auth/models.py", line 4, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/usr/local/lib/python3.4/dist-packages/django/contrib/auth/base_user.py", line 49, in <module>
    class AbstractBaseUser(models.Model):
  File "/usr/local/lib/python3.4/dist-packages/django/db/models/base.py", line 94, in __new__
    app_config = apps.get_containing_app_config(module)
  File "/usr/local/lib/python3.4/dist-packages/django/apps/registry.py", line 239, in get_containing_app_config
    self.check_apps_ready()
  File "/usr/local/lib/python3.4/dist-packages/django/apps/registry.py", line 124, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

Replying to Tim Graham:

Please see TicketClosingReasons/UseSupportChannels for ways to get help. If you confirm a bug in Django, then please open a ticket with details.

I will say that there's no need to call django.setup() in your settings.