Python : Django TypeError: object() takes no parameters

Question

I'm porting a django application from 1.x to 2.1 and got stuck with the error that says "TypeError: object() takes no parameters". I'm trying to solve the problem for quite a while but not even got a clue even after days of debugging and searching online

Installed apps:

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.sites',
    'allauth',
    'allauth.account',
    'allauth.socialaccount',
    'allauth.socialaccount.providers.github',
    'timezone_field',
    'axes',
    'humans',
    'boxes',
    'pages',
]

Middleware settings:

MIDDLEWARE = [
    'whitenoise.middleware.WhiteNoiseMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.middleware.security.SecurityMiddleware',
]

There are no problems with the indentation,

celery version : 4.2.1
raven version : 6.9.0
django version : 2.1

Here is my wsgi.py

import os
from raven.contrib.django.raven_compat.middleware.wsgi import Sentry

from django.core.wsgi import get_wsgi_application

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "settings")
application=Sentry(get_wsgi_application())

Here is an excerpt from the error log

File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
        return _bootstrap._gcd_import(name[level:], package, level)   
File "<frozen importlib._bootstrap>", line 986, in _gcd_import   
File "<frozen importlib._bootstrap>", line 969, in _find_and_load   
File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked  
File "<frozen importlib._bootstrap>", line 673, in _load_unlocked   
File "<frozen importlib._bootstrap_external>", line 665, in exec_module   
File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed   
File "/app/wsgi.py", line 16, in <module>
        application=Sentry(get_wsgi_application())   
File "/usr/local/lib/python3.5/dist-packages/django/core/wsgi.py", line 13, in get_wsgi_application
        return WSGIHandler()   
File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/wsgi.py", line 136, in __init__
        self.load_middleware()   
File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py", line 36, in load_middleware
        mw_instance = middleware(handler)
TypeError: object() takes no parameters

Error after using CustomSentry :

in <module>
    application = CustomSentry(get_wsgi_application())
  File "/usr/local/lib/python3.5/dist-packages/django/core/wsgi.py", line 13, in get_wsgi_application
    return WSGIHandler()
  File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/wsgi.py", line 136, in __init__
    self.load_middleware()
  File "/usr/local/lib/python3.5/dist-packages/django/core/handlers/base.py", line 36, in load_middleware
    mw_instance = middleware(handler)
TypeError: object() takes no parameters

I tried to catch the exceptions using ExceptionMiddleware, now I'm getting the following error:

application = CustomSentry(get_wsgi_application())
File "/usr/local/lib/python3.5/dist-packages/django/utils/deprecation.py", line 85, in __init__
    super().__init__()
TypeError: __init__() missing 1 required positional argument: 'application'

Any help would be appreciated.

Answer 1

The error indicates that you have an old-style middleware in your middleware list. Old-style middlewares did not receive an argument upon instantiation, while new-style middlewares receive a handler.

Now, according to your settings, the only non-Django middleware is whitenoise, but you say that the error persists even after commenting that out.

Here are some suggestion to help you figure out what's going on:

• As I have commented, add a breakpoint or print statement to the Django source to figure out which middleware causes the issue.

• Make sure that the settings file you are editing is the one that is actually used.

• Use the Python shell to inspect the actual value of the MIDDLEWARE setting:

  $ python manage.py shell
  >>> from django.conf import settings
  >>> settings.MIDDLEWARE
  ...
  

Answer 2

try this in you /app/wsgi.py module,

import os
from raven.contrib.django.raven_compat.middleware.wsgi import Sentry

from django.core.wsgi import get_wsgi_application
from django.utils.deprecation import MiddlewareMixin


class CustomSentry(MiddlewareMixin, Sentry):
    pass


os.environ.setdefault("DJANGO_SETTINGS_MODULE", "settings")
application = CustomSentry(get_wsgi_application())

References
1. object() takes no parameters in django 1.10
2. Django exception middleware: TypeError: object() takes no parameters