Python 3 中的 Django 问题“super() 参数 1 必须是类型，而不是 WSGIRequest”

Question

While to use class inheritance, Python 3 fails with super() argument 1 must be type, not WSGIRequest .

I'm on Django 2.1.4 and Python 3.7.0. I am trying to see if a user already submitted an file to be analyzed, if not, he is directed to the submission page. I've tried to do not use static methods, check if it's really Python 3 (because this problem is common on Python 2), on the super class I tried to inherit from "object" while also inheriting from "View" provided by Django (because this solves in Python 2 super() argument 1 must be type, not None ).

This is the super class, it inherits from the class provided by Django "View".

class DatasetRequired(View):

    @staticmethod
    def get(request):
        <redirects the user>

This is the base class

class Estatisticas(DatasetRequired):

    @staticmethod
    def get(request):
        super(request)
        <do various other stuff>

I'm expecting that the base class' get function while called will call the super class get function and check if the user already submitted the file.

I get:

TypeError at /estatisticas super() argument 1 must be type, not WSGIRequest

Answer 1

You have misunderstood how to use super() . You'd pass in the current class and an instance or class for the second argument, not the request object. The result of that call is a special object that knows how to find and bind attributes on the parent classes by disregarding the current class.

In a staticmethod context, you would have to pass in the current class as both arguments :

class Estatisticas(DatasetRequired):
    @staticmethod
    def get(request):
        super(Estatisticas, Estatisticas).get(request)
        # <do various other stuff>

I'm really not sure why you are using a staticmethod here. When handling a request, a special instance is created for a view, so you normally use normal instance methods . At that point, in Python 3, you can use super() with no arguments:

class DatasetRequired(View):

    def get(self, request):
        # <redirects the user>

class Estatisticas(DatasetRequired):

    def get(self, request):
        super().get(request)
        # <do various other stuff>

Python has enough context to know that super() needs Estatisticas and self as arguments without you having to name those.