'list' object is not callable

[Bhoopesh sisoudiya]

Hi all,

How to resolve this exception in generic view of rest-framework- api
Exception===================

2020-02-14 08:30:33,523 - D:\futuredatapoints\futuredatapoints\logs\14022020.log - ERROR

ERROR:D:\futuredatapoints\futuredatapoints\logs\14022020.log:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Exception Start %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

2020-02-14 08:30:33,523 - D:\futuredatapoints\futuredatapoints\logs\14022020.log - ERROR

2020-02-14 08:30:33,523 - D:\futuredatapoints\futuredatapoints\logs\14022020.log - ERROR

ERROR:D:\futuredatapoints\futuredatapoints\logs\14022020.log:Traceback (most recent call last):

  File "D:\futuredatapoints\env\lib\site-packages\django\core\handlers\base.py", line 124, in _get_response

    response = wrapped_callback(request, *callback_args, **callback_kwargs)

  File "D:\futuredatapoints\env\lib\site-packages\django\views\decorators\csrf.py", line 54, in wrapped_view

    return view_func(*args, **kwargs)

  File "D:\futuredatapoints\env\lib\site-packages\django\views\generic\base.py", line 68, in view

    return self.dispatch(request, *args, **kwargs)

  File "D:\futuredatapoints\env\lib\site-packages\rest_framework\views.py", line 479, in dispatch

    request = self.initialize_request(request, *args, **kwargs)

  File "D:\futuredatapoints\env\lib\site-packages\rest_framework\views.py", line 380, in initialize_request

    authenticators=self.get_authenticators(),

  File "D:\futuredatapoints\env\lib\site-packages\rest_framework\views.py", line 274, in get_authenticators

    return [auth() for auth in self.authentication_classes]

  File "D:\futuredatapoints\env\lib\site-packages\rest_framework\views.py", line 274, in <listcomp>

    return [auth() for auth in self.authentication_classes]

TypeError: 'list' object is not callable

WARNING:django.request:Bad Request: /api/send/otp/

url====== ===========================================================

url(r'^api/send/data/$',UserViewSetCustom.as_view(),name='user-view-set-custom'),

 view generic class ================

class UserViewSetCustom(generics.CreateAPIView):

    """

    A simple CreateAPIView that for sending otp for user.

    """

    # permission_classes = (AllowAny,)

    authentication_classes = [TokenAuthentication,],

    queryset = User.objects.all()

    def create(self, request):

        print("*******")

        return Response(

            data=jsonResponse([],

            msg=Message.getMessage('NOT_ALLOWED'),

            status=status.HTTP_200_OK),

            status=status.HTTP_200_OK,

            )

Thanks

Bhoopesh Sisoudiya

[Jorge Gimeno]

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I did some experimenting in the Python shell.   What I found is this:

 jlgimeno@jlgimeno-Lenovo-G50-45  ~  python3.8
Python 3.8.1 (default, Dec 31 2019, 11:21:33)
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a = [1]
>>> b = [1,]
>>> c = [1,],
>>> a
[1]
>>> b
[1]
>>> c
([1],)

The variables a and b are both lists with a single object, but c is different.  It is a tuple, with the first (and only) element is a list.  c is similar to your authentication_classes variable in your view because of that trailing comma which makes it a tuple.  As you can see in the last two lines of your traceback, django rest framework is trying to get a list of authenticators using a list comprehension, by calling each class that is an element of self.authentication_classes.  It's not getting a callable back, it's getting back a list.  Lists are not callables, and so Python raises an exception.

To fix this, remove the trailing comma in your authentication_classes variable like so:

authentication_classes = [TokenAuthentication,]

That should work. Hope this helped!

-Jorge

[Bhoopesh sisoudiya]

Thanks, Jorge Gimeno this is working fine. 

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