Instantiation in return statement before loop in DRF APIView permission

[cmokVnash]

Hey guys I am having a hard time understanding the following return statement code in django drf APIView source code:

def get_permissions(self):
        """
        Instantiates and returns the list of permissions that this view requires.
        """
        return [permission() for permission in self.permission_classes]

I understand that permission is the key iterating through permission_classes but what on earth is the permission() instantiating? I can't find any permission class in the whole APIView source code by which permission() should work.