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.

@JPG my wsgi contains nothing but the code mentioned in the question. — iamrameshkumar, Aug 31 '18 at 06:50
update the question with your `INSTALLED_APPS` please; and your `MIDDLEWARE` list is not in the right order. `'django.middleware.security.SecurityMiddleware',` should be _above_ `'whitenoise.middleware.WhiteNoiseMiddleware',` — Burhan Khalid, Sep 02 '18 at 05:03
Included my INSTALLED_APPS settings in the post. There is no difference in the error log after moving up the django.middleware.security.SecurityMiddleware — iamrameshkumar, Sep 02 '18 at 05:41
I would suggest adding a breakpoint (or print statement) before line 36 in `django/utils/deprecation.py` to inspect the variable `middleware_path`. — Daniel Hepper, Sep 03 '18 at 12:42
Have you checked your versions of middlewares? It looks like whitenoise would be the culprit. Did you `pip install --upgrade` it to a version that is compatible with django 2.1? — Laurent S, Sep 03 '18 at 13:10
@LaurentS Whitenoise version is 4.0 and is compatible with django 2.1 as per the documentation (http://whitenoise.evans.io/en/stable) — iamrameshkumar, Sep 03 '18 at 16:54
The error persists even after commenting out whitenoise middleware in settings. — iamrameshkumar, Sep 03 '18 at 17:17
As is mentioned above, I would try to figure out which middleware is causing the problem, either with a breakpoint, or by adding a `print` statement just above the line that causes problem. — Laurent S, Sep 03 '18 at 17:36
https://stackoverflow.com/questions/49003357/type-error-in-get-wsgi-application-in-django-2-x-with-python3 this refers to a similar problem but there is no answer posted. — iamrameshkumar, Sep 03 '18 at 17:39
No it's proper in the actual code. I think there is some formatting problem when I copy pasted the code here — iamrameshkumar, Sep 05 '18 at 20:26

score 9 · Accepted Answer · answered Sep 06 '18 at 14:54

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
...

inspecting settings doesn't give me any different result. I will try putting breakpoints in Django source and find out which middleware causes the problem and I think that is the only way to a solution here after. — iamrameshkumar, Sep 06 '18 at 19:09

score 4 · Answer 2 · answered Aug 31 '18 at 07:21

4

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

answered Aug 31 '18 at 07:21

JPG

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Now I'm getting the same error starting at "application = CustomSentry(get_wsgi_application())" – iamrameshkumar Aug 31 '18 at 15:23
I guess it's something to deal with the get_wsgi_application(), you must be able to reproduce the error if you just create a wsgi.py in a project with the same code as above and try running it with the mentioned dependencies (celery 4.2.1, raven version : 6.9.0, django version : 2.1 & python 3.5) – iamrameshkumar Aug 31 '18 at 18:58
Related to the error "Since you are using the new MIDDLEWARE settings, your Middleware class must accept a get_response argument" as said in https://stackoverflow.com/questions/42232606/django-exception-middleware-typeerror-object-takes-no-parameters. If it is my own class I could have added get_response argument but the wsgi is actually a library and I don't have any control on it also it's in the latest version. – iamrameshkumar Aug 31 '18 at 19:05
Is it something related to the order of the MIDDLE_WARE settings?, I tried the possible combinations as much as I can. – iamrameshkumar Aug 31 '18 at 19:17
I couldn't reproduce the behaviour :( – JPG Sep 01 '18 at 04:21
@Ram Can you find out which middleware class is causing the problem by commenting out the middleware class from settings.py? – JPG Sep 02 '18 at 08:59
I'm trying various possible options. I will post it if I could find anything. – iamrameshkumar Sep 02 '18 at 09:51
1

Can you add the whitenoise version ? – JPG Sep 02 '18 at 09:57
whitenoise version is 4.0 – iamrameshkumar Sep 02 '18 at 11:21
1

Did you tried to run the server by commenting out whitenoise middleware ? – JPG Sep 02 '18 at 13:34
I tried to catch the exceptions by adding a ExceptionMiddleware, I'm getting the error "TypeError: __init__() missing 1 required positional argument: 'application'", Updated the same in the post. – iamrameshkumar Sep 02 '18 at 19:43
1

I reproduced the error by adding a custom middleware class as mentioned in my references-1. Is there any way you could share the project? – JPG Sep 03 '18 at 00:17
Sorry, I can't share the project. https://stackoverflow.com/questions/49003357/type-error-in-get-wsgi-application-in-django-2-x-with-python3 refers to a similar problem but there is no answer posted. – iamrameshkumar Sep 03 '18 at 17:43

Python : Django TypeError: object() takes no parameters

2 Answers2