Not working with python 3.10

[mhbahmani]

Hi,
Recently we upgraded our docker image python version to 3.10 and now our APIs are not working, because of the django-prometheus middleware error. All of the incoming requests are getting failed and the code raises an exception.
sentry is showing problem in this part:
django/core/handlers/base.py in _get_response at line 200

                # Complain if the template response middleware returned None (a common error).
                self.check_response(
                    response,
                    middleware_method,
                    name='%s.process_template_response' % (
                        middleware_method.__self__.__class__.__name__,
                    )
                )
            try:
                response = response.render()
            except Exception as e:

It seems there is a problem with middleware_method.__self__.__class__.__name__,

Upgrading the django-prometheus python package to 2.2.0 was not helpful.
Is there anyone who has this problem?

[RomanUsov]

Hi everyone,
I have the same issue but didn't find a solution so far.

[RomanUsov]

I had exactly the same exception:

Traceback (most recent call last):
   File "/usr/local/lib/python3.10/site-packages/django/core/handlers/exception.py", line 47, in inner
     response = get_response(request)
   File "/usr/local/lib/python3.10/site-packages/django/core/handlers/base.py", line 209, in _get_response
     middleware_method.__self__.__class__.__name__,
AttributeError: 'function' object has no attribute '__self__'

And the problem, in my case, turned out to be in sentry-sdk and not in django-prometheus. Sentry wraps all middlewares with their own handlers and that was the problem. I updated the django and sentry-sdk packages to the latest versions. And the problem has gone.
I think the problem was related to this function because they actually return the wrapper instead of the real object.

I was on:

django==3.2.16
sentry-sdk==0.16.0
django-prometheus==2.2.0

Upgraded to:

django==4.1.5
sentry-sdk==1.12.1
django-prometheus==2.2.0

Hope this can help someone

[anarcat]

i think this bug can be closed, we're running django-prometheus on Python 3.11 without issues here.